I was also thinking the unreleased G2 decos could be repurposed.
G2 Dirge, maybe =
Cloud Camo Skywarp:
http://tfwiki.net/wiki/Ramjet_(G1)#Notes
Or maybe if you're getting revisionist, a sky deco Skywarp and Rainforest camo deco Thundercracker, based on but not exactly beholden to the unreleased designs.
I didn't think about these until you mentioned repurposings:
http://deriksmith.livejournal.com/65408.html.
We technically don't know the leg, head, or hand colors of the jungle deco one.
Maybe an Acidstorm with G2 Repros and some neon from KOs. Kinda sucks that the age of this mold is seemingly over because when they were cheap, you could do some interesting kitbashes with minimal paint.
Likewise, the jungle deco one could be Thundercracker, especially since the next Thundercracker we got was a camo deco from G2. I guess what I doubt is that G2 Skywarp would be purple at all. Optimus Prime and the early release Dinobots seemed like the only ones with color schemes intact.