This sort of mosaic-y, rigidly geometric style would only fit in with certain website designs, and the colors in the examples are all extremely saturated. I thi

This sort of mosaic-y, rigidly geometric style would only fit in with certain website designs, and the colors in the examples are all extremely saturated. I think having to sort through these would be really exhausting on the eyes. Also, it reminds me of the geometric defaults Gravatar resorts to if someone hasn't uploaded a photograph. (http://www.gravatar.com/avatar/98287fc0f05ebed1c2aae6bc2d236d3a?s=80&d=identicon http://www.gravatar.com/avatar/98287fc0f05ebed1c2aae6bc2d236...) (http://www.gravatar.com/avatar/3fbdc6a307d10a1725a54b2b391b5cfd?s=80&d=identicon http://www.gravatar.com/avatar/3fbdc6a307d10a1725a54b2b391b5...). I hate to say it, but it's a common rule of thumb in graphic design that people like to see other people. Faces. That's what user icons tend to be, because it's what works.