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I honestly think that Google is aiming to be smart enough to understand that a red widget, green widget and blue widget are really all the same thing in different colors, and that at some point in the near future that kind of nuance will kill the need for 89 mostly duplicate pages. That feels really, really thin to me. As for getting the words on the page in a way that isn't utter spam, what about serving a photo caption along with a color selection? Making sure your images are appropriately named like "red-widget.png", working the colors in in such a way that they're providing useful context to the image being displayed?