I was extremely fortunate to spend a day with MaryBeth Shaw at Art Is You earlier this month. Her class was all about adding texture to paintings. We used stencils, paint, wood pieces, and cardboard. These are three 8X10 pieces I made in class:
And here's a closer look (click on any to enlarge):
I really love the rich texture and deep blues and browns. If you ever have a chance to take a class with MaryBeth, go for it!