This is a good representation of what your window coverings should look like....with a small/pale print that fades in the background a bit (with the exception of the roman shades....they need to be mounted inside your window)
This is the same fabric as the tan I pinned originally. It would work well too. The key to your windows is going to be to have a small scale print or solid panel to help your drapes fade into the background a bit.
This artist has some beautiful abstracts in colors that would be great with your room....tans, grays, golds, etc. The link to her website is here...do you like these? http://www.minigallery.co.uk/Erica_Kirkpatrick/room1/