Here's some familiar item (and two versions of a custom item) from the Super Mario Bros. series, custom sprited in 16x16 and 32x32 sizes. That's a ? Block, Brick Block, Empty Block, Super Mushroom, Fire Flower, Starman, 1-Up Mushroom, Gold Mushroom, 2 versions of a Poison Mushroom, and 2 versions of an original shroom known as the Deathshroom. Touching it is instant kill.
I had to rate this T because the Deathshroom might be unsuitable for young children.
Everything in this image uses the NES palette. If you decide to use these in a Mario fan game, you may want to recolor them.