Wedding Wednesday: Following a theme

One of the many challenges I've faced in my wedding planning is the theme. Our day is going to have lots of baseball flavor, but I have to be careful not to let it end up looking like a child's birthday party. The balance between fun and class can be a delicate one. And it's hard to see how it will all come together when I'm really only assembling it piece by piece.

Here are some images I've found on Pinterest that I've used as inspiration. Some of them might be some of my exact choices. Others just gave me an idea to build on.

How did you keep to your wedding theme without going overboard?