Summary

A very safe, very low current/voltage night light.
I'm making so many that I simplified the design. I can now keep a blank 'in stock'.

Instructions

Printed using clear PLA. 0.3 mm layers, no support required.
See http://www.thingiverse.com/thing:267662 for full details of creating electronic base.
Print diffuser and place over LED.
Print 2 off Drum, glue together back to back.
Choose and image, re-size to fit onto drum, print onto OHP clear film and cut out.
Spray drum face with clear lacquer, whilst still wet, position image onto wet lacquer (this will glue it to drum face), wait for it to dry. Spray a couple of coats of clear lacquer on top of image.
If required, repeat on other drum face.
I have also created a 'Twilight Sparkle' version, but I don't have any photos of that, once the child sees it, you've lost it!

Children's Night Light