Personally I think pink makes everything come together the best, and my second favorite is the green. Imo, the blue just throws it off from the palette a little too much.
My favourite one would be the pink one because it just gives the setting that candy floss style which I love a lot and the green one just looks like normal grass with candy like trees, and finally the blue one, the blue one looks pretty good, it matches the path, but it doesn’t match the tree colours (pink, purple, violet etc). Overall I choose pink.
The reason for having the grass be blue is so that everything doesn’t look monochrome (which happens with pink grass) and so that it also goes along with the theme (which the green does not). The pink option makes everything pink and honestly, it can get quite boring with that. Green grass just makes the trees and the stones of the path stick out like a sore thumb. Blue is the perfect choice.
I think green looks best because it provides a nice contrast/base that nothing else will really match, allowing the more important stuff (candy trees, lollipops, etc) to stand out more. The pink just seems to draw a lot of attention to itself and kinda overload you with the color. I think the blue would be my second choice. That’s my take on it. (Love the trees!)
Go with the blue, its a gender neutral color the way you have it. The pink is too bright and as a boy i would not like playing for too long with that as the main color of the game.