You can certainly use colored sheers behind drapes. Look through JC Penney and you will see many, many combinations. But it seems to me that what you really want is to darken the room a bit. I don't think the dark window treatments are going to accomplish that. Beige walls and carpet and a white fireplace are not going to play well with your dark on dark window treatments. Since new paint is not an option, put some big stuff over that beige paint. You want to spread the dark/forest look around the whole room at eye level rather than going for a sudden blast of it on two small windows. I don't know what is on your walls. But I think you could bring the outside in by choosing some woodland fabrics and using them to cover some large canvases. Or you can frame some large sections of wall with molding and either put fabric in the center or paint just that area. I'm assuming you don't want to paint because you've got that big two story high room in a large open concept area...painting the whole thing is a big deal. So don't paint wall to wall, paint big sections that can be the background for any art you hang.

I think this is pretty fabulous and is available on many sites, including Houzz: Cosmopolitan rug I googled Emerald Green Area rug and got lots of hits....not sure of size/style/price you want but there are some pretty ones here (altho the cosmo above is my fave): Area rugs

omg Chelsea you exaggerate. really, really. you made me blush . now my cheeks match my pajama pants. wearing red today. lol (i'll be fine i guess. falling down is hard but am used to it)))) i love nosoccermom's suggestions..my reasoning for a shag was because you've got carpets. which to me makes more sense for venturing into more textural..difference? you kinda say "ok i've got carpets? I pile on it even more so" wood would give more possibilities of course-flat-weave, sisal, you name it.

Before I forget again, Janette, could you tell me where you got the windowpane chairs? I really love the style and the pattern. I think the painting your daughter doesn't care for would work, especially if you like folk art; although, you may have to listen to her make fun of it. : ) The other one might have a little too much green in my opinion. Botanicals would look great, too. This print of a 19th Century painting would look beautiful above the two chairs. It's offered on houzz as well, but I found it matted and framed at Walmart.com