Here are my Hluss stand-ins. I was thinking about converting them to make them match up better with official illustrations (weapons, more upright torsos, three eyes), but in the end, I couldn't be bothered. All that's needed for the game are gribblies with pointed snouts and scorpion tails, and these Irregular Miniatures scorpion bugs have those already.
I painted all six in a couple of hours last night: quite refreshing to get a whole encounter set done at one sitting, even if the paintwork's primitive!