This is another technique that I've used in my last project for "My Acrylic Album". This technique is very simple. Just use a thick card board and apply some gesso on one of it's edges. Then, scrape the edge against the acrylic pieces. You can scrape on the edges of your acrylic pages and acrylic embellishment too. To add some colours to your acrylic, you can mixed the gesso with some acrylic paints before you do the step above.