I have been twiddling about with this, I am thinking of a kind of pulsar engine. It works kind of 'now you see it now you don't'. Depending on a specific 'refraction' during 'flight' it is slightly out of sync.
Anyway I am stuck. I can't seem to get the rest out of my head. I suppose the closest thing to what I am thinking of is the old warp drive out of star treck. I have a sneaky suspicion it's also a 'sheilding' mechanism, as when it's operating it would be outside space time! Anyway, I gave myself a headache.
Some of the colour values aren't right though. I never did think Einstein had the equation right. Trouble is We only got to do a lot of Binary, I think I twigged that colours were easier to calculate, and it's much prettier drawing pictures. There again it might just be a lot of delusional rubbish....