htop's visuals was also very centered around its color scheme. I picked cold colors deliberately, focusing of cyan (because I like it) and green (for that Matrix-y look; it was 2005 after all, and I wanted to use a UI like the ones we saw in movies; top circa 2005 looked like an 80s bank terminal). Hot colors only appeared in the htop UI very sparingly, as red accents ("red alert!").
Seeing other top-like tools use the same colors made me feel like "I made it" as a dilletante graphic designer.