I don't know, or care, whether these have been suggested yet. If they have, it helps reinforce how much the community wants them.
Guitars and Keytars for Sonic Powers! That would pretty much make me roll any number of alts. I'd be willing to buy a booster pack with those options if I had to sell my kidneys and most of my heart. On that note, a Guitar option for War Mace would be incredible.
Also, why does Dark Melee have the most boring animations in the history of boringness? Aside from Shadow Maul, which I'm not really crazy about, there's as much action in the animation as a Senior Center Break Dancing competition. I can understand that from a design point of view it's more of a 'Magic'-ish power set, but I think it could stand some dazzling. I'd even be happy if they offered something like the Fire Sword animations for some of the powers, i.e. Smite, Shadow Punch, Shadow Maul.