Also pictured: Deroma Cabo Terra-cotta Clay Planters, 4.7", $1 each, truevalue.com. Green Barn Orchid Supplies Rustic Clay Orchid Pot, 4", $3, shop.greenbarnorchid.com.
Use painters' tape to mark out a pattern on a terra-cotta bowl, then paint between the lines of tape with craft paint. Let dry; remove tape. Brush on a clear coat of sealant to protect the pattern.