Another of my new favorite 'things' is homemade texture paste. It gets an 'ohh, ahh' from me everytime, don't ask me why but I'm always surprised when it turns out. I use acrylic paint, pva and talc - measurements? of course not, just a blob of paint and glue, then add the talc until you get the consistency you want. When you mix it you'll be sorely tempted to add water, but DON'T, just keep mixing and it will incorporate, promise. Then you just smear it through your stencil and let it dry. I've also done this with bicarb, which gives a lovely gritty texture.