If we're sharing.....
The basic transistor switch circuit, with LED indicator, used to switch power to a gearhead motor. Built on a random scrap of protoboard, using solid hookup wire. (The servo cable passes under the board with no connection - I just used the board and its mounting screws as wire-routing.)
Same circuit, but directly switching an array of LEDs, rather than a relay (remove the relay and suppression diode from the circuit). Built on random perfboard. The wire is salvaged from an old data cable that was being thrown out when we changed buildings at work. A 20-foot, 40-conductor cable provides enough brightly-colored 24-gauge solid hookup wire for a lifetime of projects. The bundle of rainbow-colored wires at the top of the photo were salvaged from an 18-conductor printer cable, which supplied lots of brightly-colored stranded wire for applications that call for more flexibility than solid conductors can provide.
A trio of transistor switches, laid out on perfboard, and again driving LED arrays instead of relays. Red, green, and blue wiring and status LEDs correspond to the driver circuits, while the yellow wire is for the return signal. Same source as above for the wires.
Driving a relay again, this time for house current. this board controls a desk lamp for use in time-lapse photography projects. Using a signal from the camera to turn the light on only when a photo is about to be taken means that I don't need to leave a lamp on and burning 24/7, when I only really need it for about 15 seconds, every hour or two.
For scale purposes, all of these circuits are built on standard perfboard, with 0.10" hole spacing.