Minecraft-based mods in other games
I came across this Skyrim mod today. It replaces various weapons and creatures with ones based on Minecraft like Steve, creepers and zombies.
What sort of things do you think would be cool minecraft-based mods for other games? A minecart for Mario Kart? Pistons as launching platforms for TF2? Breakable/buildable blocks for Skyrim?
 As in movable ones for an engie to place