It's the quintessential symbol of Halloween: the Jack-O-Lantern. Fortunately, it's also one of the easiest designs for a baker to make. Just take one round cake, ice it in orange, add a cartoony face, and...voilá!
AAAEEIII!! Er. Heh, sorry. Let's try that again.
Voila!

That's...not a cake.
[rolling up sleeves]
Voila! 
Is that...
plastic?
Cheater.
Voila!

A Pumpkin Poo-nicorn. Well.
That's a first.
[through gritted teeth] Voi-
la.
What the...what IS that? Come on, seriously, there's no way you could make this thing look
less like a pumpkin!

Allow me to retract that last statement.
Knock, knock.

Well?
Orange you glad I didn't say "voila?"
Hm. Maybe the problem lies in trying to make the
whole cake look like a pumpkin. Maybe if the baker just drew a pumpkin ON the cake...

[blinking]
Um...
[more blinking]
Voila!

Dorota, Carra M., Melody N., Shanna T., Andrew M., Ted, Donny & Amanda, Kaitlin K., & T.A., don't ask me; I'm going with "abstract jack-o-lantern."