I guess everyone knows the famous Super Mario mushrooms.
It took me a few minutes to make these in Inkscape, but I have no idea what do with them now, so feel free to use them for your own fan art.
Just use the download link to get a .zip package with a 630x669px .PNG and the .SVG file for each mushroom.
If for some reason you really do use my mushrooms, please leave a link to this place in your work's description and send me a note or leave a comment here, with a link to your work, so I can see what you've done with them.
Of course, Super Mario, its characters, setting, etc. all belong to Nintendo.