Tie On Bottle Cap Taps!
I didn't have time to read through all of the replies, but I saw a really cute idea for using old snapple type bottle caps for kids, even if you don't have kids, you may know kids, want to act like a kid, donate them to a school, kids club, etc...
Make ordinary shoes into temporary tap shoes!
step 1: make 2 holes near the rim of the cap opposite each other.
step 2: take hemp, other strong small diameter rope (or really any fastening type material that suits your fancy or the child's) and weave it through the two holes, knotting the "rope" on either side of each hole to prevent slipping through, or you could use two pieces, one "rope for each hole.
step 3: with your shoes on, tie the rope ends around the top of your shoes, bottle cap underneath with the flat part of the cap facing the ground, towards your toes, but not too far forward that the cap comes off on the first tap! Or you could try tying the "rope through the toe end of your shoelaces!
Step 4: go out side or inside, to a "tap friendly" floor, making sure you are not going to make scuffs and irritate the primary floor cleaner, floor owner, etc!!!!
step 5: Tap the hours and days away!!!!
this is a great birthday party/sleepover/etc. activity for boys and girls who have been walking for at least 4+ years. Though I would say anywhere from 5 to 105 depending on the free-spiritedness of the kid!
Hope this helps or at least inspires