Why? Because I can.
I also wanted to have a warmer look that is less business-like/bland. For reference (change is inevitable), it currently looks like this:

I’ve been reading a lot about old-timey blogs of yore lately, and the nostalgia hits hard. I don’t want to fully embrace all the sometimes questionable aesthetics of that era (late 90s, early 2000s) by having busy backgrounds, random MIDI files tooting on the home page and so on, but some actual colour might be nice.
Inevitably, I retreat from these changes and may do so again, but for now, enjoy a little green and yellow instead of the more standard blue and white.