I recently got Watercolor - The Spirit of Spontaneity by Karlyn Holman.
She's got some very cool ideas for texture. One is webbing spray. I couldn't find it locally but did find it online. I bought the black, gold and white.
The second one was done with black and gold, the rest are just black. Each one has one wash and the last one has some water splatters as well. I'm going to add some more color and texture techniques and see what happens.