I took a shot at retexturing a few things. I utterly failed at making glass (FFFF, transparency) and the rails are just a recolor of the original, but I rather like the bedrock. I also think it could be used as obsidian.
Er, I think the green smoke doesn't fit the dieing enemies puffs at all; TWW's whirlwinds seem so out of style. How about new versions of black smoke clouds, as if they try to use a vanishing spell to disappear?