They make good icons, easily readable and established, but they are really very close to the original S&M sprites. When I hear Wizard of Oz I think whimsical magical pun-laden stuff, maybe the icons can reflect that? (No idea how your interpretation of WoO will be).
For example, crystal ball instead of an eye, a leather pouch instead of the cardboard box... But I like the idea to pull down a set of icons- gives you more screen eastate.