If he wasn’t so well known as a national saint in so many countries, he probably would have been excanonised as a probable myth.  I think.  I know his feast was demoted, because of the dubiousness of his history.  However, I’m not going to start complaining now.

Flowers: red roses, English roses (those pink wild ones, I think), etc.
Flag: of course
Hooray for: fairytale princesses, knights in shining armour, myths and fairy tales
No room for: dragons, pedantic truth-tellers.
Food: anything English, or better still, since he comes from Turkey somewhere, anything Turkish.  Mmmm: Turkish Delight….