Thanks to your inspiration I did a few castings with a slightly modded cavity, and just for good measure a few regular ones as well.
Had a sit down with the kids letting them choose most of the colour combinations - although I did temper the selections slightly

Gonna pop out this weekends with the kids and try them in the water.
I really should try to find where the heck I put my powder paint, pretty sure it's somewhere in my work shop :dodgy: