Dragonwing Corki (487 RP)
Chrome Rammus (375 RP)
Boom Boom Blitzcrank (260 RP)
*Note: Boom Boom Blitzcrank has received a texture rebalancing on the PBE! Here's a few previews of what he will look like after the next patch, 4.18, goes live.
[Current on Left, texture rebalancing on Right]