I made this little box for my 6 x 6 papers using some leftover foam core I had laying around.. I simply measured and cut my pieces and glued them together with a hot glue gun. Then I reinforced all the outside edges with masking tape. Covered with paper and added a picture from an old, small calendar to the front. I also made dividers by cutting the backing from paper stacks/pads down to size. The tabs are made from 2" strips, folded in half, then cut to 1 1/2 inches wide. Punch corners with corner rounder.
The box is a bit wider than intended because I ended up gluing the sides to the sides of the bottom piece instead of on top of it. I have plenty of room in it so I stuck an additional piece of foam core inside to partition it (though it's not glued) and my embossing folder samples I keep on a ring is behind the paper.