Artangel: Mixed media crumpled tissue technique - tutorial - basically, glue tissue paper over a canvas, let dry. Paint, let dry, then rub pastel or chalk over the surface to highlight the texture. Would be an awesome way to vignette around a painting.
Mixing Acrylic Paint Colors Color mixing techniques Mixing acrylic colors is fairly simple: Combine colors and mix using a palette knife. But once you’ve mastered color mixing, you can explore some more creative methods.