After printing the excellent Space Invader Fridge magnets (https://www.printables.com/model/217667-space-invaders-refrigerator-magnets) , I decided that I needed an explosion.

Not so easy as there is a lot of space (no pun intended) in the explosion so I created a base which can be printed either the same colour as the fridge door or transparent.

Small hole in the back for a magnet.