The LCD screen maybe- However I am sorry I will have to give you a definite no on the dual processor g3. There is a few overclocking tutorials for it out there, and You could paint the case.
Mobile-2.2Ghtz Core 2 Macbook, 4GB ram, 160GB HDD
Server-Dual 1.42 MDD G4, 1GB ram, 4 random hard drives.
PC-C2D 2.4Ghtz, Asus Commando, 2Gb ram, 3 hdd's in raid 5, 8800GTS.