No More Crocodile Tears
one problem with the micro:bit comes when you are using crocodile clips, the clips will often move on the micro:bit contacts and cause unexpected things to happen. a low tech solutions can be made with sturdy card and elastic bands.
make sure the bands hold the clips tight, for extra security you can add bands at 90 degrees to the main band.
Ping Pong Diffusers
Ping Pong balls make great diffusers for LED's, and are very easy to make. Just make a small hole, smaller than the LED in the ball with something sharp, taking care to keep the ball still(can use playdough or blue tack to make a pad for the ball). Then gently push the LED into the hole. You can then glue it in place and your done.