I saw this "Rubik's Crew" Optimus Prime figure at Staples the other day and I kind of regret not picking it up. $12 and made to compete with the Funko Pop! figures, the Rubik's Crew Optimus is actually a puzzle, like the name implies. It's head is a Rubik's cube puzzle! That's kind of great. What a fun gimmick for the collectors market. Sadly there's not too much in this line; just Optimus Prime, Spider-Man, and Pinkie Pie from "My Little Pony". I hope they make more, but I get the sneaking suspicion this may be the end of it.
Weird side note; I have 8 Megatron figures, but no Optimus Prime. Actually, I have never owned an Optimus.