The only thing I would like to see in a Starcraft 2 Mod would be the Hyperion as a capital ship.....
Or make one big mod that takes ships from all sorts of games / shows and puts their coolest looking ships into the game to replace the current races ships..... *hint hint*
Imagine having a Hyperion, with a Wraith Hive, with a Ship from Babylon mod with a ship from another mod all floating around in space owned by one player 