Yeah, why not?
After the events of the last session in my campaign (the storming of a ruined manor inhabited by bugbears), I started to wonder "what lies beneath?". I'd already decided that the bugbears don't actually live in the manor house, they just use it as a kind of base of operations. Like any self-respecting "humanoids", they live in a series of tunnels underneath the manor and the nearby village. So I started drawing a map of said tunnels, and then came to think "well, what else might be down there, cohabiting with the bugbears?". Ooze was not the first thing that came to my mind. However, after laying eyes on this lump of melted purple candle wax, the possibilities of ooze & bugbears living in subterranean harmony became suddenly rather vivid and appealing.
I've only recently started using miniatures & a battle mat (since starting to play Savage Worlds), and this is the first time it's occurred to me to use something unusual and creative as a miniature. Let the floodgates open!