Check out info on resin casting. You have a mold, mix the resin with a catalyst. Whatever is in the mold gets embedded in plastic. - This link doesn't include info, but it's a reminder to go check out more info on resin casting
Turns out making crochet hearts are very simple once you get the hang of it. These hearts can be made in a matter of minutes. Use this free crochet heart pattern to make a Valentine's Day Heart Garland. There is a pattern for 2 hearts.