We used a cardboard we had saved from our last Ikea purchase and freehanded the basic shapes.
We decided we would make it more simple and just use a few colors: yellow, white, blue, red and pink which was a mix of red and white. And then I decided to outline it in black which I think added a lot. I highly recommend marking the color areas. I may have painted the white part yellow first oops.
After letting it dry we cut it out with the junkiest scissors I have since cardboard is great for wreaking scissors. We held it up for pictures but we’re planning on taping a few yard sticks to the back for the actual party to set up a photo station.