How would you make this material?

Sphere is an example. I have a double sided material and my goal is to make the flower side animated.
I’m ok with the background part, it slowly moves with time because of #frame Value node.
The flower is a black-white alpha
I want the flowers to
a) be random size and position-wise
b) use only the white part of the picture
c) move up with Value node and absorb to nothing somewhere near the green line

I don’t know enough about nodes to understand how to solve this issue.



Vornoi Random Texture.blend (110.7 KB)

Use a 2D Voronoi to do random placement and animate with math:

Good luck.