If I owned a glider the first thing I would do is paint it dayglow orange.
Not allowed. Any color other than white traps the suns rays, heating up the internal structure. Which is made of composite. Which loses its strength very fast above a certain temperature.
That's why all modern composite gliders (and powered aircraft too, eg. Cirrus, Diamond, Europa) are white.
Likewise many people begin to feel motion sick on their first couple of flights of anything long than 20 minutes,
Yep. Turning in tight circles in a bumpy thermal definitely requires some getting used to.
Seen from the ground up, gliding looks like a real serene activity. But once you're up there trying to hold on to a small thermal, it's bloody hard work. And not quite quiet too.