I have my two tanks on top of an Ikea bookshelf that has several spots, so I just crammed all of my stuff in there...I don't care much because i'm a horribly messy person. Maybe I'll get a box or something later on and keep the stuff in my closet.
These are all great suggestions (maybe make this a sticky?)
I wouldn't do the plastic drawers because the look isn't what I'm going for. The baskets are more of what I like. I was thinking about checking the craft stores, but the goodwill and yard sales are something I didn't think of! :D