Hi Qwerky,
Welcome to the forums.

You could probably assemble one of those vertical gardens that are all the rage here at the moment where I live. They can be used both outdoors and indoors apparently. If you just type in vertical gardens indoors in google images, you'll get lots of amazing ideas and could probably adapt a small one into one of your window areas. Some of them are called living walls.

mrsD, I just love that Botanical Interests site. Thanks for that!