Interesting to hear that they can change at all with HRT, I didn't know they could.

Mine have been a dark brown tone since as far as I can remember, I don't remember their color before puberty though. (But my hair did change a lot with puberty, it used to be straight and pretty, amazon-like; T messed it up completely, to the point I couldn't even grow it out before HRT without it looking ridiculous)
Maybe my eyes have gotten a little wider, or maybe I'm just looking at the world with less apathy now, can't tell. I've been on HRT for almost a year now, and haven't noticed any significant differences on that area,
like X-ray vision. I'll be sure to pay attention to it from now on.