Not really sure if I did this correctly, but here it is anyhow 🙂
All of the background polygons have a normal blending mode.
For the first shape on the left I used screen for the circle and hard light for the star.
For the middle shape (my favorite) I used difference for the circle and exclusion for the star.
For the shape on the right I used difference for the circle and screen for the star.
It’s pretty neat to see how different you can make all three of them look from each other just by using blending modes.