So many great ideas!! Here are mine with a couple repeats:
Perfume puffs
Babies for adults without them
Adults for babies without them
Cotton Candy but with a bright lemon yellow body (I had a pony dream with her in it)
More German rainbow ponies
I would love to see some original sculpted poses (new poses carved for a specific country that are exclusive to that country) but I think that is me just wanting more G1 poses to look at lol
Really far fetched too
Wingers!
Any variation on Starshine
Brightly colored ponies in general