Elie, it gets good sunshine during the late afternoon. We already have a breakfast nook in the kitchen..
Maybe a comfy chair in front of that window would be nice, with some comfy cushions and bookshelves. It would make a nice, somewhat private reading room. Love those ideas, Pika, lady pi and preciousjeni!
And of course I would LOVE to make it a Theta-themed room but my current roomie isn't a Theta

I might have 2 sister move in with us in the fall, though, so maybe we could hang some cute, subtle things, like pictures of kids flying kites or something