Having a Baseball theme baseball baby shower, but looking for a little more vintage look!!
Could you scuff the new baseballs by sanding them a little? Then rub some gel stain LIKE THIS UNICORN SPIT around on them to give them a vintage effect? (cute them btw!)
Run over them with a vehicle
Give them to your dogs for a day or two! Just kidding. A gel stain would work.
Maybe soaking them in a strong tea solution.....it works for tea towels to make them look vintage.
Do you know any kids who wouldn’t mind hitting them around a few times? Is there a local ball field you could go to and rub them in the dirt a bit? Otherwise you could try this dry rub technique with paint or stain https://www.justalittlecreativity.com/2011/08/diy-paint-rub-technique-to-distress.html
Staining them should work!