I knocked it together in my lunch hours over the course of a week. The costume was made entirely from a cardboard box, pink wrapping paper and some white wool... it's amazing what can be achieved from such humble items!
My boss representing France as a French Fancy (despite the fact that French Fancies are not actually French, but a British version of Petit Fours) and she brought baguettes and cheese.
I represented Spain, came as a flamenco dancer and brought: "Paella" (aka vegetable rice) "churros" (aka yumyums and chocolate sauce for dunking) and chicken+chorizo skewers.
My sister represented Greece, dressed as Medusa - I made the serpenty headdress! (on the night she changed into a toga with sandals) and she brought a bit of a meze platter including olives, koftas, hummous, tzatziki and more!
Joanne represented Italy, came as a pizza (including a pizza-cutter hat!) and brought yummy pasta and mini pizzas.