Follow-up re: LJ not threading (Friends page color-supporting styles)
The LJ support folks were unable to reproduce my problem, but they did point out that one of the FAQ pages addresses the question of which layout styles offer which features, which (once you drill down) provides a list of The styles that support Friend Colors on your Friends Page.
Some people commented they also missed that feature, so I thought I'd let you know.
Some people commented they also missed that feature, so I thought I'd let you know.

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I also tend to give people color combinations that mean something to me - being a sportswriter, that's often the colors of a team that plays near them or the college they attended. Sometimes, though, it is just whatever feels right.