I was introduced to this technique through a swap hosted by my pal Janis. She included a link to a great video tutorial by Linda Israel
A Masterboard is basically a large collage that is then cut down into multiple ATC sized pieces to be used as backgrounds for ATCs or even as ATCs themselves. Once all the paper pieces are secured, you can stamp or add embossing powder to tie it together before cutting, as I did below.
This is a great way to use up scraps that one may have littering a workspace. For smaller Masterboards, I often use the large junk mail postcards as the base, and then I begin layering my paper scraps on it with Mod Podge.
I’ve also made them when a swap calls for specific colors, such as yellow and blue. These Christmas ATCs were made from a Masterboard:
I’ve joined a few swaps recently that require the use of a Masterboard, and have received some great ATCs. These two were made by Beverly in Ft. Worth.
And here are a few more made by myself and others from Masterboards: