One program my CP was with did/does this. Nothing extravagant but fun. They've never had an issue. I'd love to do it for our gym now but we aren't always at the same hotel.
Do an Instagram search for locker decorations as well. We did this for our team before State this past season.
Once my son's football team went to a tournament. I was the team mom and wanted to do something special. So I got brown scrapbook paper and cut out a football with a Cricut. I put their name and # on the football and taped them to the doors. They were all so appreciative of it. I have one of the moms still mention it to me still.