I realize that, being one of the "original six," I hardly have the right to plan out a custom, but I did anyway.
It took me some time to decide what I wanted, but I finally know! I'm doing a tribute to a very, very old friend of mine. Yes, way back when I was a wee sprat, I invented him--the great and terrible Attobeast--to protect me from bullies and the nasty names people called me. Most of the time, he just looked like a cute turtle--albiet a funny-colored one--but when things got tough, he said the word "BUDDYGUARD!" and transformed into my protector, the enormous ice dragon called the Attobeast.
Of course, he wasn't actually great and terrible. Just great. He was actually a big sweetie. <3