Pulled a Power Supply Unit (PSU) from an old PC. Tapped off the +5V, +3.3V, and +12V lines and connected them to screw-posts, plus another +12V tap going through a regulator to give me a variable 0-to-about-10V port. The potentiometer shaft controls the variable voltage tap. LEDs for power-on (red) and standby (green), plus a front-panel power switch round out the device. Oh, and a handle scavenged from the miscellaneous part box. :)
Front and back pics. Yes, I still have a lot to learn about tidy cabling.