1. the second method is also cool but i like this one. paint black then put flower petals down and make a flat flower and a stem, spray red around the whole thing and take off the flowers and stem... it will leave a black trace natural stencils rock!2. you can place something like a flower pettal on the paper then spray over it so it becomes hidden, make sure it was a flat pettal, put on your clear coat and feel the texture when its dry.
WARNING (for second method)! i would sugest putting the color you spray on the pettal under the pettal also incase it flakes off after a while even though this doesnt usually happen. put the same coat under so if it does flake off it doesnt just aeave a white spot