More to explore:
book shelf love
DIY Jewelry Storage-- make a radiator shelf!
bench and shelf
Tiny flat solution: Radiator shelf
cool idea for radiator.
3 Easy Ways to Liven Up Your Radiator | Apartment Therapy
How to Turn an Unused Table Into Two Nightstands
I have a couple of tables I think I could cut in half and use as shelves under windows...
Studio apartment shelf is great for books and other stuffs. very neat and girly and vintage looking