Has anybody suggested a "Zac-in-the-Box" skin yet?
I don't have a picture, but I can probably make one if needed.
He'd look like a wooden puppet, but he'd have a box instead of legs. His arms and waist would be metal springs, so his elastic punch and jump wouldn't be a problem. For his ult, he'd just collapse into his box and close the lid. He could explode with a shower of nuts and bolts or confetti for his AoE.
His passive globs could be smaller boxes, though they'd probably get confused for shaco's, so maybe nuts or springs instead.
When he dies, he could disassemble into a head, arm, arm, and chest.