Found a pic of one in an eBay auction, I wonder if it's the same one macman has.

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Good question. From the pic (and it's not great, so it's hard to tell) it looks more "stylized" than the one I'm remembering. The one I'm thinking of was more opaque in the translucent white, but also came in other colors as well. Still, the idea is the same, which is to make the mouse usable.