Start by gathering your supplies: Brusho's, Watercolor paper (cut into fourths, trim later), Craft sheet or other waterproof surface, spritzer bottle filled with water, and 2 paper towels.
Choose 3 complimentary colors, I chose yellow, orange, and blue. Sprinkle two colors lightly on your paper, you can always add more.
Spritz with water with a light touch until colors begin to blend.
Add third color and spritz again. Add more Brusho as needed and more water as needed.
Continue to spritz and you can tip to blend the colors. Area's that muddy, get too wet, or that you want to lighten dab with the paper towel.
Some people prefer to wet the paper first but I get more control with the method I showed, experiment with both and see what works best for you.
Assemble as desired using scor tape:
I used Repeat Impressions 708-K Rebecca and 4525-K Sunbeams for my card: