Thanks for all the feedback, chaps. The flags I made on the PC, printed out and then overpainted. At some point I'll make them available through the blog.
The purple is a foundry triad. When they work, they look great, don't they and take the pain out of painting. Usually I'm a basecoat, GW wash, highlight man, but the Foundry Method - or Dave Andrews method as Rick P will tell you it should rightfully be called, gets good results and I can justify the extra effort on characters.
The "tre kroner" flag with the black and white (and sometime purple) colour scheme has a link with modern day "Deira"