Today, St. Patrick's Day, I passed these out to my friends. Next year I'll have to make more because even though i made nearly three dozen, I ran out in less than fifteen minutes.
Step 1: Supplies
-Plastic, milk jug sides work great
-Vacuum Former. Sheekgeek has a cheap and easy was to make one How to Make Your Own Prototypes: How to Make Your Own Plastic Vacuum Former
-Green food coloring
-Spoon(s) and Knives