Leave it to Martha (pun totally intended) to come up with something so fantastic and so seemingly simple that I actually might attempt it.
Step 1: Get some leaves, heat some wax (simple enough, right?)
Step 2: Dip 'em in wax, let 'em dry (Okay, okay, I think I can do this)
Step 3: Hang them up somewhere where everyone can see them and say things like,
"How did you doooooo that?"
"Oh my gawd, that is soooo pretty!"
And now, we wait.
Hurry up and change you leaves!