I love that you have an official league in your neighborhood; I wish I would've seen this contest sooner! I would love to get something like this going for my buddies and I. (I live in Minnetonka. Where are you guys located in MN?)
Here is my proposed logo for your league--I think it is important to keep it clean and simple, as it needs to look great on multiple mediums and at all sizes (from possible large signage and boards, down to embroidered caps or equipment in the future). I kept it simple and bold in color options and layout, allowing for easy reproduction onto game boards, bean bags, balls, etc.
Let me know if you like this, and I will be happy to flesh it out further with a wordmark if needed (although it does work great on its own as a league crest/shield). Thanks for looking!
Thanks for the info about the league on the main page. Just a heads up (although you are probably aware now) only your top-ranked designer can provide new designs. You can change up the rankings as you wish, but no one else can upload files but the designer in the top spot.