When I had my A3000 I was setting up a majot eye candy Workbench with Visualprefs and Power Icons. The problems i ran into made me restore the system though after not figuring out what was causing it to be unstable.
Clean system with Power Icons only installed with a few icons was fine. So i would do a massive icon replacement and ALL icons were replaced with mostly OS X and KDE ones. All was great. I would reboot and 9 out of 10 times my system would not start. If it did, any apps that used the reaction GUI would cause a crash. I had a Voodoo 3 and 128MB of RAM so it wasnt a RAM problem, when I restored my system with just glow icons all was okay again. It drove me crazy!