This is a technique that I've come up for Scrapbooks 'N Stickers. It's a technique on altering chipboard. I've named this technique as the "Sand Rock Effect" technique.
Here are the steps to it.
1) Cover your chipboard piece with a layer of scattered straw crackle paint and let it dry completely.
2) Apply some black diamond stickles randomly onto it and lightly spread it all over the chipboard with your fingers. Let it dry.
3) Apply some vintage photo distress ink all over it and black soot distress ink on it's edges.
I hope you all like this technique and start creating some sand rock effect on your chipboard now!