'Do It Yourself' can mean a million different things: tools, projects — wood, metal, plastic — plumbing, wiring, welding — woodworking, house building, auto repair.
What's something that you've always considered doing yourself but never investigated? Making paper? Smelting ore and purifying metal? Applying enamel coating to a bowl? Spinning linen from flax? Building a flying machine? Filling a cavity in your own tooth?
What's the most far-out DIY project you can think of?