I like taking pictures of things in windows* because of the layers you can see all in one glance. Here's one I took at Universal Studios Orlando where the streets are set up like an old Hollywood backlot of New York City. Of course I did my favorite Poster Edges filter and boosted the color in Photoshop to make it more interesting.
When you shoot the images, look at your scene carefully before you snap to make sure the actual elements and the reflections line up in a pleasing way.
here and more Photoshop filters here.