I managed to get over 90000 on a run with Pearl's Palette. I think the exact number was 90055. To be fair, I had all hacks enabled, but that's the best way to get the highest scores.
Some quick math; a single colour chip is 500 points, and tone chain bonuses increase by 100 points per chip for each chip in the chain. Assuming a full palette of 36 of the same chip, you have a base point value of 81000. From there, the only modifiers left are remaining lives and membux, I think.