Things With Actual Uses

I'm putting together an informational session for some friend's kids that are interested in 3D printing and I'm wondering if folks have any ideas for things to print while we talk. I'm thinking of simple items that print quick (done in about 1/2 and hour so). Ideally I'd like to show them some things then start a print and be able to give them something to take home.

So far I've only found a diamond shaped object that is printed hollow.

My other idea is some sort of easy keychain with their names printed.

https://www.youtube.com/watch?v=cW-lO9wwBFI

https://www.xyzprinting.com/events/en-US/worlds-first-3d-printing-24k-gold-filament-material/

Did anyone find?

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The Minishelf is here to come to your rescue ;-)
It's easy to print and super quick to put on the wall with just double sided tape.
And i finally have enough places to display all the nice little figurines i find here.

And the look very cool side by side, too.

https://www.thingiverse.com/thing:3416868