It would be cool to have your Mac boot up to a custom pic. Even if it is for a few seconds lol. I'll try reducing my png file even more but even the sample icons it comes with don't boot up. The color changes as expected but not the apple logo.
🙁 Perhaps someday they will release a patch to fix this issue with bootxchanger changing the background color but not the main icon. (sad face) i really liked my custom black background with this as the icon.