Help! I'm lost in the big blue!

Voilà, Lola must bring some food at school next week (it's the "week of the taste" in French schools, like every year)
Her teacher has chosen the blue colour as a main theme (not white or brown or green, of course not!)

She can bring whatever she wants, except candies and sodas.
Michelle brings bilberries muffins if I remember, others bring figs, grape, blue cheese, blackberries and... Jeez, all my good ideas have been stolen! And I won't bring sardines! oh nenene!

Last idea I got was mint... but isn't it a bit green? (sigh)

Any idea about blue food?
Blue might be inspiring (for me it's the "twilight blue" that beat all the other kinds of blue) but with food... hell no!


(patchwork of borrowed pictures, thank you, you talented photographers)