I would love the acrylic markers for drawing on rocks and hiding them!

Acrylic Paint Marker Pens, Waterproof Paint Pens for Rocks Painting, Ceramic, Glass, Wood, Fabric, Canvas, Mugs, DIY Craft Making Supplies, Scrapbooking Craft, Card Making (24colors) https://www.amazon.com/dp/B07WLC43VZ/ref=cm_sw_r_cp_api_i_qCkNEbSYQKHZE