This was a super fun multi-day, mixed media project with a lot of different techniques and processes.
Day One: Start by painting papers with a paint scraping technique. Use scraps of cardboard dipped into neon paint (Amazon affiliate links have been used at no extra cost to you- the money goes towards maintaining my blog and buying art supplies) and scrape across your paper to create an interesting textured effect. Make several pieces of paper in different colors. Leave these to dry for the 3rd day.
Here is a video with steps to make the scraped painted papers.