Can you switch your home office to another room so that it's not the first room you walk into as you enter your home?

What ever room you use, try turning the desk so that you face the open room (your back would then be against the wall). Desk would be moved out about 3 feet from the wall to give your chair space to move. Center desk on wall and don't put it in the corner.

Center the credenza behind the desk on the same wall. Similar to this set up.

Adding the rug, but also adding more prints above the credenza which I would also suggest you placing on the back wall - will make the room much more interesting. For a rug choice, I would select a bold graphic that incorporated your wall color.

What are your favorite colors? Look for rug which has those colors in them. Also if you are so inclined you could use one of the colors on one wall and also in items you get for your desk and in the pictures you will get as you add to your collection. Have fun with this and remember that not everyone can afford to get it all at once.

I would use the rug and art work to bring some color into the room.

i would consider bringing in some of the colors from your artwork to your rug...here are few that i just glanced through on Joss & Main

couple more...

OH,,, be still my heart.... love that ceiling anne dee;))

Leelee's suggestions about taking your desk away from the wall is excellent.

And Dommat11 carpet suggestions would nicely tie in with your artwork. Just make sure the carpet you choose is big enough. It should cover most of the floor, leaving about 12 to 18 inches of wood flooring showing around the room.

I think your room could use softness and color through drapes, etc. Some upholstered chairs would add a lot. In the green picture, the black and white rug works because of the colored wallpaper. You could add any pattern and color wallpaper above your wainscoting. Depends on other rooms.

By the way...LOVE your art!

Maybe for nature lovers CARPET MOSS, possible forming eny shape eny color, mixed nature tones :)
here is samples
http://www.google.lv/imgres?imgurl=http%3A%2F%2Fwww.lilyboutique.com%2Fblog%2Fwp-content%2Fuploads%2F2014%2F01%2Fa4cc862839603fa8ac64f8ba0f578c321.jpg&imgrefurl=http%3A%2F%2Fwww.lilyboutique.com%2Fblog%2Fhome-and-garden-angela-adams-rugs%2F&h=487&w=736&tbnid=96IlgrQfLutJ1M%3A&zoom=1&docid=gztqoeKH_jn0JM&ei=Q2RsVK-OH-TgywPQsYLYAw&tbm=isch&client=firefox-a&ved=0CGoQMyhFMEU&iact=rc&uact=3&dur=1289&page=3&start=45&ndsp=28
http://www.google.lv/imgres?imgurl=http%3A%2F%2Fwww.decor4all.com%2Fwp-content%2Fuploads%2F2013%2F04%2Fgreen-carpet-wool-rugs-floor-decor-2.jpg&imgrefurl=http%3A%2F%2Fwww.decor4all.com%2Fdesigner-rugs-carpets-adding-wool-warmth-grass-silkiness-modern-floor-decor%2F22394%2F&h=364&w=625&tbnid=XgdWbBZ8-uLl9M%3A&zoom=1&docid=raro3GVfWwh6IM&ei=Q2RsVK-OH-TgywPQsYLYAw&tbm=isch&client=firefox-a&ved=0CFAQMygrMCs&iact=rc&uact=3&dur=1204&page=2&start=20&ndsp=25

Yes, teal would be beautiful. Esp the deep colored one Dommatt...suggested with photo.

I looks to me that your office has more of a contemporary feel :) Since you feel your room is bland and needs a pop of something bright to spice it up, I found this rug that has subtle pops of color and a nice pattern to add more dynamics to your office. It still fits the contemporary theme to your office while adding a pattern to enhance the space. Let me know what you think! Thanks. -Chandlar Olson :)

P.S. Here's a link to the rug if you decide you wanna check it out!
http://www.westelm.com/products/mosaic-triangles-wool-dhurrie-wave-t976/?pkey=crugs-flooring&cm_src=rugs-flooring||NoFacet-_-NoFacet-_--_-

Thank you all for your awesome advice! I ordered the dark teal rug that dommatt1 suggested. It was perfect because I already had a credit at Joss & Main! I am going to rearrange the desk and other furniture as lee lee suggested, and I am considering adding a window covering and either paint or wallpaper. Thank you to everyone who gave me such fabulous advice! :)

That's awesome. I love joss & main. They have beautiful things and prices a great. I happy that I could help out. Enjoy your office.

You picked the best one. Love that dark teal.

A lovely printed rug would be nice or a cream color one if you're the minimalist type.

Wainscoting comes from a time they liked oriental style carpets on wooden floors. It would add some colour and style. Just search images in Google for 'oriental carpet' to start.

You have beautiful tone-on-tone and excellent contrast as well. Overall the room has a very sophisticated and classy feel, so you're going to want something that appeals to what you already have: I think you will find faded / blanched soft-spoken vintage rugs in our shop to be an easy and viable means to furnishing the area rug dilemma. http://oldnewhouse.com/collections/rugs/vintage-rugs Below are a few that would look stunning!

Your space is elegant and modern. I like your taste based on the artworks that I see (aside from artisan rugs, I'm passionate about artworks). I suggest, an artisan rug that's also a statement piece. Something with distinctive colors but still has hints of your furniture's colors (brown, black, bit of blue and green) to tie up the space.

Visit my shop and just message me if you have questions.

Use a low-pile Flor tile from www.flor.com. Literally hundreds of styles to choose from. I balked at the price, but finally put them all over my own house. They're totally worth it.

I love the soft buttery colour on the walls... here are some rugs I like that are fairly inexpensive but would allow you to bring in some colour:

and a few more... I don't know what your style is in terms of modern or traditional but hopefully you find one that speaks to you! If none of these work I also liked the turquoise ones that were suggested a bit earlier in the thread by #dommatt1. All the rugs I suggested are from http://www.americanrugcraftsmen.com/ but I would also try www.owrugs.com too.

I can't help you with a rug. But I can suggest ergonomic furniture that will be useful for your health.