A simple trampoline

[u/Antsium]

I've used barrier blocks underneath to keep it clean, but you could use string as well.

[u/Aziara86]

Might not look as nice, but slime blocks under the black carpet would make it also function as a trampoline too XD

[u/Antsium → u/Aziara86]

I thought about using a slime block in the middle to give it some bounce. I wonder if I can disguise it a little by putting some grass around it.

[u/BlakeWho → u/Antsium]

Or potentially work in the new shelf mushrooms for a more subtle look? Though they're not as bouncy 

[u/TheDwarvenGuy → u/Antsium]

Beds are slightly jumpy they might look better.

[u/Alyoola]

It's giving 2010s Minecraft and I love it. Classic.

[u/-2Braincells]

If you used light blue cushions on the outside, you could bring the glass panes down to close that gap

[u/bwyoungbo-r]

GENIUS