This whole "has to be unique" and "looks too much like" argument is so overblown.
Do we really think someone is going to accidentally start following the wrong team because they've got the badges confused.
There are 1,000 indicators of which team is which and the badge is a small part of that.
It just needs to be nice looking that the majority of fans are on board with which we currently have.
No matter what you do there will always be dissenters.