Crimson Valor has created a gallery of 'What Would X Character Do' banners for general use. To be frank, though, I don't think we need them. It's fairly obvious:
Pinkie would party.
Twilight would read.
Applejack would buck.
Rarity would make a dress or something.
Fluttershy would hide in a bush.
And Rainbow Dash is the bush.
The gallery for those is here. He has also created a gallery of 5k-resolution cutie marks for your vector needs. You can find those here.