Since last week, I've been making a set of LED stair lights for the house. It's a piece of 2 core mains flex with 8 LEDs spliced into it, and a control box to dim the circuit and also turn it on and off under the control of a couple of switches. The tricky bit was working out how to have a switch at both ends with only 2 wires (the LEDs are wired in parallel.) I've now built the circuit on breadboard, and done the LEDs, and it's looking really nice. Should get it finished and installed over the next day or two.