Kiteman told me about [http://www.core77.com/bullitts/2005/08/House-Special-Solo-Bookshelf.asp?current_bullitt_number=0¤t_bullitt_id=296 this] one. It holds only one book but it's really easy to make.So take what ever you're using, (surveyors tape, caution tape, cloth, ...
So for this you'll need:
A wooden dowel (I found one in my mom's closet full o tools and things)
Duct tape (Very easy stuff to find)
Surveyors tape but preferably something stronger. (Mine was $2. You can get it at someplace like Ace. It isn't sticky, it's just for things like tieing on stakes to outline something on the ground like where a house will go. You could also use other things instead.)