Liberally apply watercolour and place leaves (pressed and dried) or other flat wrinkly things on the watercolours. Let dry over a few hours - this will allow the pigment to settle mostly into the raised areas and create beautiful prints!
If you love using watercolors in your projects, try these Watercolor Stickers and Ribbons. You can use watercolor tape to make stickers, ribbons, and so much more. Watercolor tape is specially made to not break when it gets wet.