If you regularly print A3 or larger sizes, storing the paper can be a nuisance. If you don't have large enough desk drawers, you can get effective results by combining a couple of wooden magazine holders from IKEA.
At IKEA Hackers, Vinny details how he attached a pair of Knuff magazine files ($17.99 for two) to the underside of a desk. Not a complex hack, but easier and more helpful than just putting in a shelf. For more IKEA hacks, check out our top 10 IKEA buys under $10.
Knuff is e-knuff [IKEA Hacker]