What ingredients can be added to pasta to give a different color? I've experimented with fresh pasta, using the following ingredients to color it:


Beetroot puree
Carrot puree
Cocoa powder


The first two were successful, the cocoa poweder resulted in a very visually appealing but rather disgusting pasta.

Any other suggestions for stuff you can put in the dough, other than the banal versions using spinach or dried tomatoes, to make for interesting colors?
We use spinach to color and flavour fresh pasta.