I've decided to make this a project instead of submitting a bunch of skins.
Super Mario -
Fire Mario -

Gold Mario -

Ice Mario -

Flying Mario -

Now onto Luigi.

Super Luigi -

Fire Luigi -

Silver Luigi -

Ice Luigi -

Flying Luigi -

I will add more powerups (aka things that aren't recolors) in the future. They will most likely be either added into this or put into another submission (series 2 maybe?)