The lid has embossed circles which create slight wells for mixing paint on the inside and bumps on the outside. I decided to turn the bumps into seashell.
Golden's Micaceous Iron Oxide acrylic is great for getting a gritty, sandy look so I went with acrylic to paint this lid. I did light sanding, but skipped applying gesso and went straight for the acrylic paint. I used the Iron Oxide, Cobalt Teal, Green Gold, Buff Titanium and Titanium White.