Sometimes, just applying one art medium over another gives a cool effect. In fact, I learned a lot of these duo combinations from a book called Mixed Media Pocket Palette. I'm going to teach you one of the combinations that looks super cool.
Plus, you get to try a texture goo you might not have tried yet. It is a sand texture medium. You can buy sand texture gel on amazon or you can actually just mix sand with either gel medium or acrylic paint. Here's a post from Art Is Fun that covers a lot of information about texture mediums.
Supplies:
Acrylic or craft paint
Oil or Chalk Pastels
So I went the easy route and bought the sand medium on Amazon. It was a decision helped by the fact that I didn't have any sand around, so a purchase needed to be made regardless.
Start by squirting some sand