You have a lovely home and beautiful windows. If you don't like window treatments, I would go with the roman shades and put them everywhere for a cohesive look. Although I'm a (simple, no frills) curtain person myself, in your space and with your likes I think the roman shades that match the walls would be perfect. I would forget the toppers, sheers or anything else that you don't really like, because it would be a pity to break up the beautiful lines of your windows. I personally wouldn't do anything different in the dining area since I think a cohesive look in areas that can be seen as a unit is best. On the other hand, if you like the roller shades I wouldn't worry about what anyone else thinks. Only you can decide if you like the look and it will be appropriate there. Good luck and trust your own instincts. You've done a great job in decorating so far!

Simple panels in a color similar to your wall color wouldn't detract from the view.

By the way, your home is lovely!

Inside mount Romans would look nice. I would go with the same color in both rooms with your open floor plan. They usally come with a 6 inch valance so unless you really wanted to I would not do a top treatment, unless you decide on roller shades which I don't care for much. But I would use a top treatment on them to cover up the roller.
Only draw backs of the romans are their either up or down, can't control the light too much. Another treatment to consider is horizontal sheer shade. Soft and elegant but can control light much better. Here's a link if you want to take a look.

Here is a link that might be useful: Horizontal Sheer Shades

Beautiful! Leave the living room windows alone. For the windows around the piano, I would swag fabric starting at ceiling height and droop it down on windows, mabe a six inch droop. then let the fabric go down to the floor on each side.
For you eating area, what about stencilling some words above the windows? no window treatments. just stencilling a saying across the top? some saying that you like.
Your windows are beautiful. I wouldn't cover them up.

no help here, but your room is gorgeous! Would love to hang out there:)
Please tell me about your floors.... we are about to plunge in with some new floors.

Wow - You have a gorgeous home! Since it sounds like you enjoy the outdoors view and value simplicity, I would think about simple bamboo roman blinds (from overstock or target) - I love their texture and simplicity - they are inherently neutral and I think they just always look great. Plus, you have lovely warm decor and it complement your hues for a casual look. You could add curtain panels (like the photo) but they also looks great on their own.

{{!gwi}}

Inside mount Romans would look nice. I would go with the same color in both rooms with your open floor plan. They usally come with a 6 inch valance so unless you really wanted to I would not do a top treatment, unless you decide on roller shades which I don't care for much. But I would use a top treatment on them to cover up the roller.
Only draw backs of the romans are their either up or down, can't control the light too much. Another treatment to consider is horizontal sheer shade. Soft and elegant but can control light much better. Here's a link if you want to take a look.

Here is a link that might be useful: Horizontal Sheer Shades

Can I ask if your home is a "Victorian Reproduction" home, or if it is maybe a home inspired by Victorian sensibilities? The setup in the room you've pictured, the amount and placement of windows, all say "Victorian" to me. It almost looks like a Victorian Parlor to me.

Beautiful space. I think some draperies in the piano room would soften the space and add some texture in the room. I can see roman shades in the eating area and would leave the LR alone OR add drapes that start right below the ceiling and then swag them so most of the window is uncovered (like trisha suggested).

We are not window treatment people either, but have started to add some as we've reno'd/decorated a few of the rooms in our house; two bathrooms and our office. They really do help to finish off a room. That said, we're not covering our kitchen bow window, or the DR bow window, though I might consider something for the DR window at some point--just for the window panes themselves, not to cover the whole bow-unit.

We used Hunter Douglas' Designer Screen Shades in the Roman Shade style (ours are mounted inside the frames becuase of our window style/frame depth). The shades are very clean-lined and range in sheerness. With the sheerer weaves/fabrics, you can see outside with them down and they allow a lot of light in.

I think some really nice molding around the windows and plain inside mount roman shades would be beautiful.

Beautiful home!!! I like what Laurainlincoln suggested~

I agree, the usualy mini blinds, vertical blinds, etc get old quick. I've always been a fan of the more unique blinds such as roman shades and bamboo shades. For that room specifically bamboo shades won't really work but roman shades definitely well, if not there are always drapes.

Here is a link that might be useful: Discount Blinds & Shades