Hey @donut_inspector! I hope you like your logo! How to use: Screenshot the image and then crop it to what you like, and then I think that automatically makes it a JPEG. That will probably be sorta low-quality, but the scratch profile picture has a limit of 500x500 pixels if you're using it for scratch, which is pretty low anyway, and also the logo itself will almost never be seen big.
If anyone else wants a custom logo just tell me!