You can use many types of berry, fruit or even flower petals to make dyes, pigments and inks. It's become something of a hobby of mine.
I'm doing some experiments so in future I might be able to predict the outcomes of my dyes. Until the way I worked was "wait and see" and that's very much still my approach, but this looked like a challenge that was right up my alley.
This was a lot of work and I hope it's informative. I sure learned a lot. If you have any questions, or any experiments you'd like me to make, let me know! I'm always up for a good experiment :)