Check out this site. Great plans, most free.
http://www.wood…

Bed: four dowel posts, one white sheet.

Bookcase: 6-8 cinder blocks, 3 wood planks.

College Dorm Special. Approx cost $25.

I'm not sure about the bookcase, but I just recently discovered the coolest way to make a sort-of canopy bed. If you got to pbteen.com, they have this wire thing with little clips on it, off of which you can hang curtains, so you can go all the way around the bed with the wire. If you can't envision it (since my description is terrible), just go to the website and see for yourself. It's SO cool.