Let your mouse roam around the image and see what happens. Can you find the Treeman's legs? The ripply background effects look really interesting on a 256 colour display, by the way.
I hope to add to this in the future, though I'm a bit uninspired what to do with it.
If you cannot see silhouettes against a moist coloured background, you can download the appropriate plugin (the same one used on all my anims) from here for Windows & Mac users or here for Linux users.
This is the first Linux .swf player I came across. If you know of a better one, please tell me.