(This was supposed to be for the Launch It challenge, but I never quite got round to making the video...)
Step 1: Cut...
You need to cut out a shape roughly like that, three to five centimetres (an inch or two) across. That's a hole in the middle.
When I say "roughly", I mean roughly - circular, square or even mutant-potato-from-Venus shaped. It does need the little winglets, though.
If you are right-handed
Hold the Boomeree in the palm of your hand, and look at the winglets. Fold the clockwise sides of the winglets down slightly.
If you are left-handed
Hold the Boomeree in the palm of your hand, and look at the winglets. Fold the anti-clockwise sides of the winglets down slightly.
Step 2: ...and Launch.
Point the Boomeree slightly skywards and give the winglet a hard flick.
With enough spin, and just the right launch, the Boomeree may eventually return to you.
If it doesn't, and your small charges keep losing theirs, just make a load and keep them handy. Alternatively, if they can use scissors they can make their own - there are twenty templates on the Word document below, which should work even if they are cut out with the ragged haste of a child.
A note on security
I strongly recommend, if you are planning to let somebody play with these in an airport (burn off a bit of energy before the boring flight), then either make them before you go, or practice tearing the shape out of paper instead of cutting. We can't have you wielding deadly scissors in an airport, can we?
Step 3: Why "Boomeree"?
So, boomeree - half way between a boomerang and a frisbee. Simple, really.