I've considered adding dessert sauces to slightly improve the (accidental) taste and give it a slight scent.
In terms of other effects: --rolled oats and MS Jeli-mix are great for creating a lumpy texture (giving small and large lumps) --reducing the water content, extra thick and sticky gunge is brilliant --MS VIVI-extreme this stuff is super stretchy-stringy that forms ropes and curtains, as well as siphon itself out of a bucket! --Slube and/or Slime-Baff** seemed to make the gunge slightly water repellent, making it harder to clean off after.
**These might be the same product, marketed at different audiences.