You need a trading card pocket...
Cut one pocket around the sealed edge.
Sew the vertical columns as shown. Most people use a heat fuse tool. I like using my sewing machine.
Gather up a bunch of littles to put in your little pockets.
My trick is to use a piece of paper straw that I pinch at the end to push the items down. You can also use it to filter in the smaller sequins and seed beads into the slots.
Fill in just the bottom row.
Sew across the top of the row.
Do the same for each row.
Trim around the sides... TADA:)