I remember hacking the "Start" button in 95 through 7 to say "Whee!" instead of "Start". Childish and silly, but I liked it. I miss being able to make little hacks like that.
Sadly though, this kind of hacks doesn't satisfy me the same way it did 30 years ago, when I had all the time in the world to tinker.
It's the same story with things you can customize, today I rarely bother spending more than a few seconds on clicking around to choose the next best thing.