I wish I had more photos but my housemate grew a watermelon Zkittlez cross OG Kush that had some really nice purple and pink tones. I've got one pic of it a few weeks into flower.
Later on it kept the green leaves, but had pink frosting, and purple calyx. The contrast between the pink/purple, and the green leaves was amazing.
I've got two GDP autos, a blackberry gum auto, an AK 420 auto and a Candy dawg cross amnesia haze auto that sprouted randomly over the last 2 weeks, and hoping for purple as people throw their wallets at it. The GDPs are at 12 days now, the blackberry gum at 10 and the others two have just stuck their heads out three days ago and can't be seen in this photo. The two on the far left are jacks cleaner #2 photos a few days in.
The GDP and Blackberry are supposed be purple in lineage, so we will see how they go.