Section Seeds, how to make one?

Hello good OB Community.

So here's a question I've had for a very very long time and it seems it belongs to the oral tradition that is passed from generation to generation of users.

And that is,

How on earth do you make your own Section Seeds or Plan Seeds, or basically any kind of customizartion regarding the plans results?

We all have our unique style of drawing production, and it'll be nice to be able to make our very own seeds.

Best Regards