Another product we'll be using at Messy Technique Week in April is the Stampin' Up! Stampin' Spritzer (#126185).
These are fun and easy to use - just fill them 3/4 full with alcohol, squirt a few drops of ink refills in them, shake and spritz!
This card is made by placing punched out butterflies randomly on Whisper White card front then spritzing with three different color. You can't see it here, but the butterfly pieces are all different colors and adhered on the inside of the card.