Need ideas for Marvel Now sketch covers x-post from r/transformers

With all the Marvel Now comics coming out recently, I've been picking up as many of the sketch cover variants as I possibly can. Now, here's the challenge...

I'll most likely only be attending TFcon this coming year, so coming across artists that regularly draw something other than Transformers will be challenging. So here are the covers I'd like to get designed; Hulk, Thor, Captain America, and Iron Man

I was thing something along the lines of the Jim Lee covers to the 90's X-Men series. This would of course be based on The Avengers movie, but what does this have to do with Transformers? Nothing! The other idea I had was to get the Marvel Transformers crossover figures drawn. These ones... Hulk, Thor, Captian America, and Iron Man

With the success I had with my Avengers #1 sketch cover done by Matt Moylan at TFcon this year, I'm excited to see what I can get done.

Does anyone else have any ideas?