John Lennon with his Epiphone Casino (sunburst) guitar in 1966. He and George bought identical models in 1965; in 1968, John had the sunburst finish sanded off to give the guitar a natural look, which he used from The White Album onwards, including into his solo career.
You can mix a variety of ingredients into regular tempera paint to create different sensory experiences. Try salt, sand, glitter, corn syrup, or sugar. You can even add scents (vanilla, cinnamon, essential oils).