So I've been playing with the new powder toy api and this is what I came up with:
It's a virus element. Place some near a pixel and it will turn the pixels around it into more VIRS. It dies after a while so that it doesn't cause too much lag.
(I haven't figured out how to put it in the menu, so you have to search for it)
the link doesn't work for me...
Strange, try just copying this: www.pastebin.com/vExrQqQ5