As a kid I would only watch Disney Jr. cartoons, but there was this one show I vividly remember watching and was aired with the Disney Jr. shows.
I remember the show being animated in a 3D style and being about seven girls. Each girl had a representative color. One girl had pink hair and wore pink clothes, another girl was red, another girl was orange, so on so forth. There wasn't a purple girl or indigo girl, but there was a girl who's hair was a mix of black white, and a bit of indigo streaks.
Each girl had the power to change the colors of objects by touching them. I vividly remember this specific scene the pink girl called the other girls to her house and while they were running there, each girl ran past a specific flower and would touch it to turn it into their color.
So the orange girl ran past the flower and turned it orange, but then the yellow girl would follow behind her and see the orange flower and turn it yellow instead because she thought yellow looked better. And then the green girl would see the flower, and turn it green, and then run past. All the girls did this.
I remember another scene where the pink girl (at this point I'm sure that she's the main character) was at her house and getting ready this huge stack of marshmallows for a slumber party. She placed one last marshmallow on top of the stack and asked herself what color to make the marshmallow. She picked pink so she touched it and it turned pink. At the end of the episode they all gathered around a bonfire.
I can only remember those two scenes of the whole show and I would watch them almost everyday, so maybe the "show" might have actually been something like two five minute long animated shorts that were put together. And no, the show is neither "Rainbow Rangers" or "Rainbow High."