All you need to turn regular acrylic paint into fabric paint is some fabric medium - mix two parts paint to one part medium, iron to set when it's dry, and you have a washable fabric paint! I went with some classic stripes like these from Pottery Barn, in yellow - which just says summer to me.
- Acrylic paint
- Fabric medium
- Foam paintbrushes
- Straightedge/ruler for marking pattern
Start by inserting some cardboard underneath the cushion cover so the paint doesn't seep through, and then tape off your pattern (regular painter's tape worked well)
Make sure to press down the tape edge well (such as running a scissor handle along it) so you don't get any leakage.
Then just apply your paint + medium with a foam brush, peel off the tape, follow the instructions on the medium for setting the paint, and voila! It's like a new patio set.