Is the window colour of a troll's hive the same as their blood colour?

Nope, it seems arbitrary, or maybe thematic to other stuff? Aradia’s is brown (Team Charge?), Tavros’ is blue (Vriska? Breath?), Sollux’s is pink (Feferi?), Karkat’s is orange (No connection. Early Blood color scheme?), we never see Nepeta’s Hive from the outside, but the color of the inside of the house seems reddish so it may give off that hue, or perhaps pinkish (Heart?), Kanaya’s is literally Jade’s tower so the windows have no specific color, Terezi’s is yellow (Yeah no connection either), Vriska’s is cerulean (Vriska), Equius’ is blue (B100), Gamzee’s is yellow (??? May just be, light in general being yellowish, there seems to be a lot of yellows and oranges and reds and pinks), Eridan’s is violet (Wweh), and Feferi’s is Pink (Glub!). So, sometimes it matches, it seems maybe more typical of the higher castes? It should also be noted Sollux lives in an apartment and every block of the apartment has that same pink hue to the windows, so it’s not just him.

Yeah kind of arbitrary at times.