This background was created on matte cardstock using pearlescent acrylic inks!! Just applied the colours without mixing too much and laid the crumpled cling wrap over it. The scan does not capture the pearlescense of the paint but it does make a very effective background. You can use any acrylic medium to make these backgrounds. I would recommend thinning regular craft acrylic paints to a soupy consistency to get the best results. Consider adding a bit of metallics to your work for a little sparkle. One of greatest advantages in creating your own backgrounds is how unique they all are and how little they cost!!