I really enjoy pnp games, and I do even enjoy the process of making them since it's something I can fit around life quite easily. It mostly stems from my desire for a new game, I have loads of materials so I can often make something quick to put off the need to spend more money for a while.
I don't have any particular tips, I'm happy with the games I build but I don't spend ages making perfect copies. Mostly it's greyboard I buy in bulk, full sheet labels and my trusty laser which takes stupidly cheap toners. Still don't have a great way of creating cards though due to lining the backs and fronts up, most of the methods I'ave tried take too long for the results. I often just print both sides on separate card and sleeve.