I started with cutting up the carton and separating it in squares (the part that the egg sits its a a square).
So egg carton can be a bit annoying to cut, make sure you have a strong scissors so it will be comfortable to work.
I cutted them in different sizes, so when I would layer them up and the different layer sizes would give a nice touch, painted with regular acrylic paint and used hot glue to assemble them.
I made five flowers, each one with 3 layers and some loose “petals” coming out of the center of them. I also had an old canvas that I didn’t really liked its previous art, so I painted it again over the old art. 2 or 3 layers of paint should do the job, I did 2.
Also use hot glue to attach the flowers on the canvas and a final touch of green.
Hope you like the idea, there are many other things I want to try with it and this was definitely a good first experience!