Michele, if you download the mask from the pop up view page you will then be able to use it as a pattern. I have been sizing my edge canvas image to 3600 x 300 (or whatever height the mask is) and then flood filling it with the mask pattern.
Add a new layer and in the layers palette drag it below the black and white layer then flood fill this layer with whatever pretty pattern you want the finished product to be.
Remaining on that layer I then go to layers – new mask layer – show all. Then activate the top black and white layer – ctrl A to select all – ctrl F to float and then drag the floating layer to just below the top layer of the group (not below the entire group).
Ctrl D to deselect.
Again activate the top black and white layer and delete this layer … voila! you have your edge.
I then merge the group, do something to the top edge for a slight contrast (such as adding noise) and then add a sticker bevel to the entire edge to lift it just a litte. A shadow to suit yourself.
This was definitely one of my favourite lessons by Cassel as it opens up all sorts of possibilities for creative work.
I hope this helps your creative spirit Michele! <3 ;D