If it isn't too cheeky to steal the lighthouse from whoever (is it Irish or German, I can't remember) - A dark blue burgee with a lighthouse, (possibly black/white stripes?) showing a series of beams (flashes)(red green or white) like the spokes of a wheel (preferably at an incline -oval) with one of the flashes saltire-blue (the biggest one, nearest the viewer). This could be through-printed with no loss of sense, and gives us our 'blue moment' in a series of red or whatever. No lettering required.
Then, if people ask, you get a chance to mention the forum.
I'm no use with these computer drawing things but could scan one if the above is incomprehensible.