This, That, and Some of the Other
Repotting Mat
Helpful, simple—and inexpensive—tool for your gardening tool box! This simple mat snaps in the corners and forms a tray.
It helps control the inevitable mess and chaos when you’re trimming, repotting, dividing, etc. When you’re done working you just throw away any debris, give it a wipe off, and fold it up! Easy to tuck into a drawer or shelf until the next time you need it. No more mud in the kitchen! 
(Steve will appreciate this, too. No more grit in his grub!)
Similar products available in an array of sizes, colors, and from different merchants.