Blue thoughts

You've probably been thinking a lot lately... One thing about thinking is that, whether we want it or not, we'll always end up doing it anyway... You've probably been thinking about your life, the weather, what to do on saturday morning, how awfully short is a weekend, that great place you are gonna go for dinner tonight, that cool girl/boy you are dating with, the things you avoided doing on friday the 13th, the food you need to buy for your dog, cat or zebra, hunger in the world, the state of things in Uzbekistan, how beautiful spring is, the things you never learn, etc, etc, etc... You've probably been thinking about all the things in the world... But I'm sure there is one thing you have not been thinking of... and which I've been wondering about almost for a whole day, without yet coming to an answer... So, I'll share this with you, and I you feel so, I'll gladly accept feedback on the matter...
It's not a brain eating dillema, but it's not that easy to answer either, I think:
?Is there any sort of food which is ORIGINALLY blue?
I mean, I can't pic any sort of meat, veggies, natural beverages or even fruit (crazy coloured in every combination almost) which are ORIGINALLY BLUE... I mean no dyes or colorants... 100% absolutely, originally PLAIN NORMAL BLUE...
I can't think of any... And I'm starting to get worried about it. How could nature/god/whover/however creation started like could forget this???? I don't know, but it gives a bad feeling.