I had the stock theme but actually tried one theme for about 10 minutes before I switched back. It's so weird that when I first got the phone it was this color then changed to red without me doing anything. Now it's back to this.
No, I'm saying it was red before I tried a theme. The color I posted is how the phone started but then a month later it changed to red without me doing nothing. Now it's back to the original color.
I thought a colour was selected automatically based on the contact image. You can see this if you go into contacts, chose someone with a photo, open their details and then slowly scroll down. The image will change to a colour at the top. This is based on what's in the contact image.
When someone calls, or you call someone, with no image then something random must be generated?