lots of pikachu rocks! I spent many many MANY hours on these, and actually had fun doing it. haha. The rocks used were a mixture of river rocks from the Willamette river and rocks from stone field beach near yachats oregon. (it's legal to take up to a certain amount lol). Painted with acrylic paints. Some are lined with a paint pen, and some are not because the paint pen ran out. haha. Clear coated with a brush on polycrylic protectve finish and them sprayed with rustolium gloss sealant.