I'd say the rules to a ripple effect puzzle are best explained here.
Anyways, I was making a bunch of Ripple Effects and decided to do a big one which didn't work out as I'd hoped, in that I needed some numbers to force a unique solution. But don't worry. Here it is:
(Click on the picture or here for the full size picture)
Hint helpfulness level 0
I did make the puzzle from the center of the spiral
Hint helpfulness level -1
You might as well give up if you need so many hints