Ohhhh now there’s a brilliant experiment, @Amethyst! 
At a cooking school in Thailand we used butterfly pea flowers 
for just that purpose:
The flowers didn’t add much flavor to the coconut milk, but they dyed it (and the rice we cooked in it) this absolutely gorgeous color of blue-purple 
For all the other adventurous souls trying butterfly pea tea- perhaps @Berta and @Rowan- if you ever decide to cook or bake with the tea (maybe some tea cookies! 
) def give a shout! Love to hear how it turns out 