Whoops I Think I Broke It has a quick HOWTO for making your own glowing, mysterious, revolting specimen jar filled with little bits of ick from the Elder Gods' plane of existence:
Now all we need is a "thing"
Here I've taken scraps of clay, wire, foil, wood bits, hot glue, and a cork to shape out the "thing". Basically I just took anything that was lying around on the floor of my workshop and fashioned it into whatever you'd call this shape.
Weird but not very menacing.
I then cover the thing in a mixture of liquid latex and coffee grinds (for texture).
OMG! IT SHOULD NOT BE! KILL IT WITH FIRE!
Now that this thing is sufficiently gross we're going to prime it and paint it a base color. Priming should help give us a clean slate in which to paint a fleshy pink base.
I've named this color "Krang from the Teenage Mutant Ninja Turtle's Pink".
Now we add some shade, accents, and highlights to this monstrosity. To finish I glued on a few random strands of wig hair and painted on a creepy eyeball.
(via Super Punch)