Here's something very simple and not Super Mario Maker related, it's the Poison Mushroom from the bootleg "Super Mario World 64" for the Sega Genesis.
(Credits to geno2925!)
That ugly and evil poison mushroom looks neat for SMW. This definetly makes up for the fact that we hate mushrooms even more just that it can kill you in reallife if you simply just ate 'em. Looking Forward to the future graphics you're making.