Why use the elevator as a spring? That seems a bit odd. And I already use it for the moving platforms, so I wouldn't want to confuse anybody. I essentially took the bottom half of the new brick and put it on the bottom (since that's what it was in the original Mario), and then I changed them to the colors of the high jump power-up. I know it's not necessarily the most creative thing, but it was all I could think to do. I can't use the Zebetite as the flagpole since I used it in the theme skin, and the cannon (which I would have used for the cannon if it shot out something Mario could jump on) wouldn't really make much sense as a flag. The Autrack also wouldn't really work as a cannon either because of the fact that Mario can't jump on what it shoots out. Honestly, I think Kraid would be a really bad idea for a Toad replacement, since he's a boss and not some friendly NPC like Toad is. As for the vegetation as vines, I was thinking about it, but since they harm you or block your path in Metroid 2, I don't think it would translate well. I originally was going to use the health pick-ups as coins, but they're already in the Samus skins, so I figured that if Jay implements a new health system for characters like Samus and Mega Man it would actually confuse people. I may change the boss floor in my theme skins to that though, since I am using Ridley over Bowser. I'm not sure if it will work well visually with any theme that's chosen for the castles, but I'll check it out.