Since you wanted the change of his parents to be from PinkieDitzyDash to just DitzyDash; I took basically all his warm tones/pinks/oranges and shifted them to cooler tones like Ditzy and Dash! The kept the yellow as it ties to both of them and also breaks up the various blues/greens! I kept the eyes generally the same color since I'm a sucker for orange/red/peachy eyes
For the cutie mark I tried to give a slight circus theme as you asked with a banner like you'd see big tops and such decorated with ~!