Found it on Pinterest and Actually Did It: Bottle Cap Flower
DIY Bottle Cap Flower Garden Art Stake It takes a little trial an error but all you do is take heavy duty pliers and smash the bottle caps into petal shapes and then epoxy or use a super glue rated for metal and attach to a can top in at least two circular rows. Then glue a stick to the back after it's dried 24 hrs. Easy once you get the hang of smashing bottle caps :)
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