Icon Injector

Icon Injector allows you to export and import icons in PS2 saves. Icon Injector replaces any icon that can be found in a runnable file or DLL library with another icon from a similar place: runnable file (EXE), DLL library or ICO file.

The Icon Injector program can import all the existing resolutions from the source icon, and in this manner substitute it in the destination group.
Icon Injector is a completely free tool, and takes up very little space on your hard drive: just 100KB.