This is such a fun idea! or use dremel tool on a real brick. Perhaps a small real Lock & Lock could be used instead of a film canister. Would be watertight and more fun to be able to leave signature items and travelbugs.
No more oops! moments when painting, if you cover doorknobs and hardware with aluminum foil.(I would still put tape around the base of the knob where it meets the door, then the foil to protect the knob)
Geocache Hide Fence Pole - had a gentlement show us his hide one time (we were way lost) and OMG we would have never have found it on our own. (One on Galveston Island is hidden in a post, but it's cap is missing and is held hidden by a string).
This Dremel accessory guide is great for when you have a Dremel and don't know what each tool is used for. Or maybe you have a project and you want to know the right accessory to buy. This chart will come in handy.