I was granted an old, software-less, questionably-functional Apple III by a roommate during my third year at Ohio State. Over the next two years I gutted it and built a PC with a Mini-ITX motherboard (VIA) inside it. Features include:

• Internal power supply using original power switch
• RCA output to original green & black monitor (or a TV)
• iMac USB keyboard integrated in place of original KB
• DVD-ROM drive in place of internal floppy drive
• 3D Graphics card in PCI slot
• Additional Hard Disk in old Floppy housing
• Runs Windows XP Pro

For information on the matching mouse, check out this post.