I picked up a few packs of something called nail gems recently at Dollar Tree.
I understand the purpose is to add bling to your fingernails, but I am more interested in blinging my minis!
The L.A. Colors range provides a sheet of gems, a flower-shaped container of 'flower' gems, and an eraser pencil (used to pick up the gems). I got the 'sapphire' pack, but they have others that look like diamonds or pearls.
The Mila Studio product provides a container with six compartments.
These nail gems provide more variety, but at slightly larger sizes.
What could you use these for? Treasure in a dungeon. Jewels on a character. Accents on a starship. Alien eyes. Sensors on a 'mech. Tip of a magic wand. Advanced sci-fi controls. Elven shields and armor. Weapon lens. Have fun!