I just use my name (Ron) plus whatever favorite two cars I have at the time.
Over the years, and on different sites, I've been: Ron78Z&92Z, Ron78Z&95Z, Ron78Z&85Vette, Ron78Z&01SS, Ron66Vette&04Z06, and now I'm Ron66Vette&10SS.
My next user name should be either Ron66Vett&12ZL1 or Ron66Vette&13Vette
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Previous Cars: '78 Z28, '92 Z28, '95 Z28, '85 Corvette, '01 SS, '96 Z28, '04 Z06 Corvette, '10 SS, '13 SS Hot Wheels
Current Cars: '17 ZL1(daily driver), '04 Trailblazer (rain & snow), '66 Corvette (restoring)