DIY PVA Crackle Paint
Well, I had to give it a go. I tested it out on a bit of wood. I took photos so you can follow along.
Its a simple proccess, you just sandwich the PVA between two contrasting colours of acrylic paint.
Leave this layer to dry completely.
A better crackle seems to occur when you leave the glue to get a little too tacky, to the point where you think you've let it go a little too far.
This is probably the hardest part, the impulse is to paint the second layer on straight away, but waiting will produce a better crackle.
Most PVA isn't water resistant, so it would probably pay to coat any craft project in a waterproofing clear varnish.