Add drops from two different coloured inks onto wax paper, spritz with water. Lay a piece of watercolour cardstock over the top & tap to spread the colour. Blot with paper towel to mop up excess ink or to add splodges.
Ink background by direct-to-paper, sponging, or brayering two colors of ink and overlapping colors. Background words from Local King Rubber Stamp. Tree stamp by Inkadinkado. Good idea for multiple-card set.