Free for use avatar on dA
for mushroom lovers out there...
On the right it's an authentic mushroom, and on the left it's with a smashing rainbow rave background.
Click on download to get a zip file with both of them inside, each 50x50 pixels.I don't know why there's a fail dA thing instead of proper transparency in the preview for the right shroom, but it's perfect in the zip file, so no worries.
Google search Enoki Mushrooms.