I make chimes out of them---take your pick https://www.youtube.com/results?search_query=DIY+repurposing+empty+gunshells
Here's a few ideas for you.
Pinterest has a ton of creative ideas!
You could use them to hold salt or paper, or toothpicks. Also, they could hold birthday candles.
You may want to reconsider any projects using spent shells...they contain remnants of lead which over time will make you very ill. Just a thought...
There's not enough lead residue left to ever cause a problem. Rates right up there with lead paint. My folks taught us to eat f