I am sure this will be in the running for the worst instructable, ever. But I like the simplicity. I'm not even sure what this is, but the term "riser" comes to mind. "Tray" might be a better word.
Step 1: Materials
1. flat, rigid object. I am partial to acrylic
2. silicone rubber feet. I purchased mine at Mouser, I think.
Step 2: Construction
1. pull plastic feet off from backing
2. stick onto your flat rigid object
Step 3: Use
Take a bunch of stuff.
Step 4: Et Voila!
Put it on risers.
Now you can move groups of items around, without disturbing the arrangement. You can spill coke on your desk, and these items will be spared. You can put one on your sink for your shaving cream, so it doesn't leave rust rings. Or you can post hateful comments and death threats for this 2 minutes of your life you will never get back. :)