Hi, I was playing with rusty-rain when I decided that it was a good idea to make a custom FOSS effect. For this I made a change in “sibling” project ezemoji PR and with a small local change in rusty-rain I got it. All icons are from Nerd Fonts, so if you know of some FOSS icon is missing let me know to add it in the PR, =).
Nothing hard, you need to create in ezemoji a group that contains the codepoints of the glyphs you like and in rusty-rain add that group as an option. Check my ezemoji PR that’s the example you need because I did exactly that.