First i make a number of tiles
if they have a pattern i have to remember to make them seamless before saving them
then i go to animation shop to make an animation out of it
it's realy quite simple and the variation is endless
it was all because of Q's q's about image width and so
it's in this thread where i started it with the fading colours
it's still not perfect though
i was trying to get this kind of effect:
oh, now i see how that's done, i thought it was moving in one direction but this is just a two way movement, think it is mirrorred only
now, this is more the one i had in mind