Probably just darker flames, IDK. Here’s what was done by @fer0n@lemmy.world in the past: https://github.com/aeharding/voyager/pull/1607

Here’s the requirements for adding to a build btw:

1. 1024x1024 PNG
2. No transparency
3. (Ideally) dark mode variant
4. Oh and let me know how to attribute it, like what handle you want for credit in the app icon page

I also recommend to use https://iosfeeds.com/tools/icon-preview to test on the home screen. I added your image above, and it looks like maybe it would show more detail if it was cropped/zoomed in a bit (similar to the main app icon)