I kit-bashed a "Shambler" together using an old (extremely) cheap Yo-Gi-Oh! figure. I simply hacked off his arms, legs, (stupid) hat, and his cape. I then used a bit of plumber's puddy to scupt a mouth (with toothpick teeth) and add some tenticles. He then got a prime in clear varnish (plastic varnish, Krylon I think is the brand I am using now) and a paint with some yellow, light green and lots and lots of some "super thick" ultra gloss (the 'slime' you see dripping from his tenticles).
I am quite pleased with my 99 cent figure I made with my 2 year old plumber's puddy.
A couple of views of the nasty thing are below.
Scott