Eat pistachios and keep shells.
Paint the shells desired shade of green (or blue, or purple etc).
Cut different sized circles out of cardboard.
Prep glue gun once shells are dry.
Starting in the middle of the cardboard circle, glue on the pistachio shells as shown below.
Allow the shells to slowly “open up” as you get to the outer edge of the circle.
Place in little teacups or flower pots and use as decor or gifts!