First thing I thought of was a white or beige shag rug for that contemporary look. To add color, add a large piece of art over the couch or colored pillows.If wanting a colored rug, the world is your oyster as they say, as really any type of contemporary rug would suit, just depends on your taste.
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Hi there, Yes, a rug is the perfect place to add a pop of color in your space!

You could also use a neutral rug and add the color through pillows and art, but for some reason my eye just wants to see a bright, colorful rug on that floor lol.

Showing a few ideas below - not sure what colors you are preferring, but pink would be my first choice.

You would then carry the rug color around the room a bit through your accessories.

Something like this or if you want color a Persian or Kilim which can look great in a contemporary room.
http://houzz.com/photos/10738423

Here's an article with some inspiration - any of these could work.
http://houzz.com/ideabooks/32068231

Beautiful apartment may I suggest going with a rug with a subtle pattern such as this...
http://www.restorationhardware.com/catalog/product/product.jsp?productId=prod2430652&categoryId=cat3200001

This would add a little change in color from the gray. You can tie in that blue by adding some blue accessories, I would mix the blue accessories with some wood pieces to add some warmth to the space. Good luck and if you need additional help feel free to ask!

http://www.restorationhardware.com/catalog/product/product.jsp?productId=prod1860552&categoryId=cat5300038

We have many contemporary options that would look great in your space! If color is what you are going for, you may want to try a rug that incorporates some warm colors to balance out the cools of the room.

Here are some ideas from our collection:







Good luck!

- Capel Rugs

The fabric sofa is a beautiful soft neutral color and is easy to match with light grey tones. Please see below.

I love a shag rug, especially to complement the contemporary pieces, you will love having it, they are so comfy. I would bring colour in via artwork and maybe a throw.