I think something fancy would be a nice new take on the Mane 6. (I don't know much about FiM so my apologies if my idea sounds repeated!
)
I think having something like a Princess Ball themed set would be really nice. They'd all be wearing ball gowns featuring their colours and symbols - perhaps looking a bit like this..
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login...and they would come with matching crowns/flower garlands.
Perhaps they would release special's - like Celestia or Candace.
It could be called something like "The Sweetie Belle Ball" where there is a small story about the reason behind the ball, and perhaps a small children's book illustrating all the issues leading up to the ball finally happening.
I dunno..I just thought that'd be cute.