Bubbles!
I've been experimenting with making magic & other special effect brushes lately, so these came out of that. What started as general spheres ended up in me learning how to draw bubbles, so hopefully you can use these for some easy bubble baths. :D
Since these are transparent, I put them on a black background so you can see them better:

All brushes change colors. You can either do it by changing the main and sub color, but you can also apply a gradient like this:

The same with the soild spheres. Sub & Main color on left, gradient on right.

Hope you enjoy!
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