While I have trouble calling any sock a spin-off sock, that’s what creator and knitter Ellen Botilda calls her TARDIS tribute socks. They were based on another pattern, but slightly altered. Now, all that I have to find is someone who will knit a pair of these for me!
Swallowed by Sky made the first TARDIS socks, but Ellen played with the design a bit before making her own. I don’t knit, so I don’t know how hard this is, but the best part is that the pattern is available for free here. Apparently they are easy to make if you do know how to knit.
I think what I like best is the patterning on this sock. It’s not just the colors that are used to show the paneling on the TARDIS, but the windowpane pattern is reproduced through the knit itself.