@Chris4418 - Welcome, mate!
Yep, if I'm not wrong the icons should be here somewhere (although I honestly don't remember where exactly ) and I myself have given the complete set to someone very long ago.
Anyway, if like you said you don't want to create your own icons - using only the default ones in your themes - you don't need to search: when creating a theme, just compile it without adding icons and the program will create the theme with the default ones (ie the standard icons you can see when booting the PS3)...
Here you go...
Icons are in the 'PS3 Theme' folder.