Place the cardstock down on your work surface. You’ll want to use a thicker paper like cardstock or watercolor paper so that the food coloring and water don’t bleed through and create a mess.
Grab a small dish and add a little bit of water. Add ten drops of food coloring and stir with a spoon until combined.
Repeat with other colors in separate dishes until you have the desired amount of colors you’d like to use for your art.
Use the spoon to place some of the food coloring mixture onto the paper in one area – around 4 to 5 drops to make one big drop.
Grab the straw and blow directly into the color gently, watching it spread across the paper. Continue applying dots around the paper, blowing into them with the straw to make them spread. Do this a few times and let dry.
Repeat with as many colors as you like, feeling free to layer colors. Let dry between colors.
When the piece is finished, let it dry completely. If the paper is wrinkled, you can place on an ironing board with a piece of parchment paper on top. Iron on low heat (no steam) to smooth out the wrinkles.
If desired, place in a frame to finish - or tack onto the fridge with a magnet as an alternative.