Here's another great idea from Martha Stewart's back catalog of space saving solutions, converting a traditional blanket chest into a "multitasking mini office". Inside, an organizer's dream is revealed: bulletin board, filing cabinet, stationery supplies drawer organizers...
You might have one of these blanket chests already in your bedroom, or stored away in the attic. Larger all-wood units are expensive, so you might want to consider purchasing a wooden toy chest for a fraction of the cost if you're planning to buy new.
Bamboo organizing trays like these are available at many home retailers. These specific models are $6.99-$9.99 at The Container Store.
A hanging steel file folder is as easy to install as just dropping it into your home office in a chest and filling them up with a nice set of file folders. Try assigning colors specific to the folders' contents and use for an extra bit of style/organization.
Complete instructions available at Martha Stewart's Office in a Chest.