I'm sure I'm not the only one that gets called away from the crafting desk in the middle of a project. Whether the kids start yelling, dinner is burning, or your pager goes off and you need to respond for a SWAT call (we're out there)... You don't want to leave all the work you've done just laying there to get lost or spilled on.
One of my newest additions to the "works for me" side of my storage list are these trays I found at Target. They are 13x13 so they hold your scrapbook papers and also fit in the IKEA Expedit shevling system. If you don't have these trays that maybe you can convert other trays around the house. Before this I was using paper box lids.