I used to subscribe to Real Simple, and I always loved their "New Uses for Old Things" column. Those are my favorite kind of DIYs--useful ideas that are simple and easy to implement, using common items that you might even have already. Here's an example from my house: store your earrings in a ceramic egg carton! It's cute, practical, and works perfectly. If you don't have a ceramic egg carton, they're really inexpensive--but an ice cube tray or a regular egg carton would also work.
I shared a bunch of other easy organization ideas on Bali Blinds last week. Check 'em out, and tell me: what are your favorite tips and tricks? I love learning new ones!