RASKOG carts from IKEA - spray painted after they were assembled using the rustoleum paint in "ocean mist" for the mint and plastikote paint in "cameo pink" for the pink cart. Spray paint some plastic containers to match using a plastic primer beforehand.
Mommo Design has a bunch of inspiration for girly reading nooks. These quiet corners contain fluffy pillows, rugs, cushions, usually a canopy, and of course lots of books. I think the idea is very cute and I'd love to do this for my daughter's room.