So cool! So she's like the Green Lantern with the ability to materialise any object she can think of? That would make for an interesting character sheet!
I was thinking the same as you, but thankfully the Critique Arena promt says we can include an "action" pose, so it won't just a hero standing there doing nothing. I'm not sure if you'll have the space to add additional characters though, so yeah the trampoline might be too much.