I saw a pin from Two Girls Being Crafty where they made a piece of art very simply and I thought, "I can do that too!" So I did.
The first step in their post has you spray paint the canvas but I skipped that step, I didn't mind a pure white background. They used a brown paint pen for the stems but I cheaped out and mixed my own brown paint and used a thin brush to paint the lines. they aren't as perfect and some are thicker than I'd like but it was overall pretty simple to do. Here is a picture of that step:
Then I started making the circles. I used red, orange, blue, teal, and a little black. I mixed colors together to make additional shades. It was pretty time consuming because I had to clean the sponges in between colors to vary sizes and colors at the same time. But it was easy. Here are some pictures of the final product: