im a bit tied up now, but i did a quick test in liqbase of a couple of things like that a while ago.

i have a function which will just allow the background bitmap to softly drift (that actually works on any picture in the system with a single switch), and I can have a middle layer between the background and the foreground which can be occupied by stars or flow or any other widget i want
ill show it in motion somewhere later, just subscribing to this thread tho