Here is another organizational idea I just posted in my gallery here
and thought I'd share with you. (There's actually 3 posts, but link is just for one of them.)
I use these 2 large recipe card holders from Michaels to organize all my leftovers, rejects, extras from projects. One box has all card bases, some leftovers and some I just made extras of to have on hand. The other box has die cuts, images stamped (blank), images (finished), and card mats.
There's a little more info on the posts in my gallery if you would like.
Ps. These probably should be decorated, but...