I've always taken a bit of a mad scientist approach when devising wam substances. I know I'm not alone in this, as most of us know of Jayce's 'Mystery Substance', and I'm sure other producers have come up with some crazy concoctions.
To give you an example, I've sometimes taken shaving foam and added to the right amount of water. (nearly impossible, but can be done with a paint mixer on a drill) The result is almost like a white paint, but thicker. (unless you use too much water) But it doesn't stop there. I'll add powdered polymer to the mix, also using the paint mixer. Before long, the substance has amazing strings and becomes slippery, with the appearance of marshmallow goo. (but far cheaper to make)
I've also mixed xanthan gum with water to make a nice slime, added some of the polymer mix for slipperiness/stringiness, and finally pre-mixed cake batter. Depending on the amount of water used, the result can be a thick and stringy sludge or a thin slime that has great coverage but is extremely slippery.
I've had a fantasy where a girl in a bikini or thin clothing is picked up by the shoulders and feet and dropped into a pool. While this is very common with swimming pools of water, this pool would have layers in it. Molasses at the bottom, then layers of sweet and savoury substances, such as oatmeal, syrup, cake batter, partially-melted ice-cream, pudding and custard, with a top layer of whipped cream. Some layers might include mayonnaise and ketchup, depending on how much savoury substances will be used.The girl thinks she is being dropped into whipped cream and perhaps isn't too concerned, until she feels all the unknown textures and temperatures. To me, the fun would begin when the girl rolls around and mixes everything together.
Anyhow, I've always liked the combining of substances, such as the 'slop buckets' that get dumped on girls by some producers.
Just wondering how 'pure' your personal preferences are, as far as substances are concerned?
mixing up different substances is half the fun of getting messy, for example if you mix marshmallow fluff, coolwhip , frosting and a bit of warm water you get A super sloppy, sticky, brightly colored slime that is AMAZING. I also LOVE your muliti layered pool idea , I did something similar with Brightly colored blue cake mix under a layer of cool whip , filled a small inflatable pool with it and flopped into it . Did the same with chocolate pudding and cool whip.