I designed it as a present for a friend's daughter who just turn 4.
I've used light blue for the back piece and "glow in the dark" on the front piece.
Super simple to print. Nice present for a birthday party, of course Frozen themed ;)
The stl files have a size of about 50 mm. But as you can see on the pictures, I have printed a bigger version without problems.
On the files you can find a back piece without any text and an .ipt file for those who want to add their own text.
Print with your preferred colors. I have used a light blue and "glow in the dark". Once you have the front and the back parts, just glue them together with some cyanoacrylate glue like "super glue" (If you are using ABS as me). Then I used a small ring and a blue cord to finish it.
I used a silver paint marker to paint the text of the back piece.