How come no matter how many times you dry something, lint always comes off of it?
What, you want the the fibers to be indestructible (and radioactive)?
And how come 99% of the time, dryer lint is grey?
Because most Americans wear a lot of bluejeans, and have white underwear. If you separated your clothes by colors, you would find the lint colored similarly.
life is dull and fuzzy
In fact, if you’re selective in what you dry, you can get lint in distinctive enough colors (allowing for mixing some colors of lint) that you can make a facsimile of Leonardo da Vinci’s The Last Supper fresco.
Eventually you’ll run out of lint. However, that’s synonymous with running out of cloth. Well before that point, the clothes will have developed holes big enough that you’ll just throw them out.
For some reason this just feels like a the beginning of a classic thread ala airplane treadmills or 1920s style death rays.
Maybe if you would have duplicate posted that message five or six times you’d be right.
Exactly how much encouragement do you think I need? 
On Topic: sort of.
If you collected all your dryer lint and spun it into thread and wove it into cloth and made new clothes out of it, could you have clothes forever without having to buy anything new?
First check to make sure there are no dolphins in the dryer.
Well, there’d be inefficiencies, of course. Some lint is lost while you’re wearing it, not in the dryer, and some would go out the vent, and so on. More significantly, clothes are mostly made out of long fibers, while lint is mostly short broken fibers, so you wouldn’t be able to make very sturdy cloth out of it (maybe some sort of felt).
Because the dryer is slowly destroying your clothes. Tumble your clothes long enough - and I mean really long enough - and you’ll tear them to shreds (and completely block the dryer’s lint catcher).
At my house, the wall and porch beneath my dryer vent seem to have a layer of lint embedded in them which no amount of sweeping will get rid of. Probably if I pressure-washed it, but I don’t care that much.
Personal observation: If you take your clothes out of the dryer when they are damp, they last longer and stay brighter.
When I wash my reds and pinks together, I get pink lint. Usually mine tends to be dark blue because I don’t wear white clothes, ever, not even undergarments.
Serious question: how do you keep damp clothes from mildewing?
Finish drying them on a line/rack before putting them away.
Fair enough, but if I’m going to do that, why bother with the dryer in the first place?
It’s quicker to dry them partly in the dryer, but that would only be relevant for at most one or two days worth of clothes.