How many groom’s cakes are sports related? I think it must be 50% because we do them a lot! The couple often has a hard time deciding on just one theme or hobby. We have done a few with several hobbies on one cake, but I think one theme can be more impactful. The tricky part of these hobby groom’s cakes is to keep them from looking like birthday cakes. It’s a fine line and it’s crossed pretty often in the cake world!