We have an annual get-together feast that’s coming up. There is a yearly food theme, and this one is Colors. We’ve been assigned orange and blue. Orange is easy (we’re doing pumpkin soup), but what can we do that’s actually blue and not purple besides Jell-O?
Blueberry pie.
Thought of that, but Blueberry Pie looks purple to me. At least it has blue in the name.
Blue corn chips.
Borage flowers are a lovely blue. I occasionally use them to decorate the top of cheese bread.
Mashed potatoes with food coloring. 
I have a faint memory of a food class where it was revealed if you put vinegar on cabbage it would turn blue. There’s a kid’s website about it here that might give you some ideas.
Eggplant.
Beets.
Never together.
There’s something about blue food that’s psychologically damaging. I read, years ago, an anecdote about a dinner party Alfred Hitchcock threw. He had all the food dyed blue. No one ate anything, as I recall.
Not so long ago there was an experement to make children like their veg by dying it odd colours (such as blue for greens).
It didn’t work.
George Carlin once asked this question in one of his many monologues. "Hey where’s the blue food? There’s NO blue food !! What’s that? Blueberries you say? No - blue on the vine - purple on the plate.
Yep–blue is probably the hardest color to be assigned for food. Serve bleu cheese by the poundful, and holler at anyone who objects.
Daniel
Everyone will love you if you can serve up some steamed blue crabs!
How about a big bowl of blue M&Ms? Or those blue gummy whales… or blue jellybellies! 
Or raspberry flavoured juice/soda? (why the heck is it coloured blue and not dark red? Cherry is red, strawberry is usually light pink, why do they colour raspberry flavour blue? Couldn’t it be a dark red, like a wine colour?) Anyway.
Of course, as mentioned above, use food colouring and dye light coloured foods blue (mashed potatoes, rice). OR just make something like sugar cookies and coat them in blue icing. Or a cake with blue frosting.
You could try the blue potatoes. Yeah, they look purple in the picture, but when I tried 'em, they turned more blue when they were cooked.
They taste pretty much like plain ol’ potatoes, just a new festive colour.
Most really blue foods are candies, sweets, or liquids. Jell-o, for example, but you don’t want to serve that. However:
[ul]
[li]Blue corn chips are dark navy blue without so much of the purple tint.[/li][li]You should be able to find blue corn meal at a natural-foods store. Substitute the blue cornmeal in any cornbread recipe that calls for regular yellow cornmeal, and you’ll have blue cornbread. Blue cornmeal has a little more moisture in it than the yellow variety, so the cornbread will come out a little moister and more tender than the regular recipe.[/li][li]Airheads candy comes in a blue raspberry variety. [/li][li]Kool-Aid has several blue varieties.[/li][li]As long as we’re talking beverages, there’s a Bartles & James blue wine cooler that comes by the 4-pack. For bigger bottles, there’s the bright blue Boone’s Farm Blue Hawaii “wine”. Both of these drinks taste exactly the same - a sort of pina colada, heavy on the rancidish coconut with a bright blue flavor aftertaste - which is not surprising because they’re both produced by Gallo.[/li][li]Make a plain white cake with a few drops of blue food coloring in the batter, and frost it with blue frosting.[/li][/ul]
That’s about all I got right now.
Blue Lagoons:
1 oz. rum or vodka
1 oz. Blue Curacao
Pineapple Juice
Pour rum & juice over ice in highball glass, add Curacao
Blue Lagoon Margarita:
1 1/4 oz Jose Cuervo Especial Gold Tequila
3/4 oz Blue Curacao
1 splash 7-Up
1 splash Rose’s Lime Juice
Pineapple Juice
Pour the Jose Cuervo gold tequila, blue curacao, 7-Up and Rose’s lime juice into a cocktail shaker half-filled with ice cubes. Add pineapple juice to taste, and shake vigorously. Strain into an old-fashioned glass 1/4 filled with ice cubes, and serve.
TERRA makes pretty good chips out of them.
And the blue-colored watermelon-flavored Gatorade.
Hideous stuff.
But blue.
Apparently blue is a natural appetite suppressant because blue things in occurring in nature are usually toxic.
Or, there’s always blue ketchup
Not if you eat them fresh. Navy blue through and through. With a little sugar whipped cream – heaven.
Someone already mentioned blue cornmeal, you could make polenta with it instead of corn bread.