An experiment and practice piece -- I've got green thread, and green dye, and what better use for them than something that requires a lot of green?
So I made a Green Lantern wallet, using the symbol from the comic book hero.

Here's the piece, stitched together and folded. The finishing touches are not there yet -- the top edge needs trimming and burnishing.
The colors are Angelus Green and white acrylic paint. I used the deep beveler on the ouside surface, and the backgrounder to make an inverse carving, where the white is.
The thread is 4 ply linen, in Forest Green.

I realized that by leaving the center unstitched, the fold happens more naturally. If stitches are there, they are likely to tear apart over time.

I got my stitches pretty nice this time. I'm using a GoodsJapan set of stitching chisels (3 mm).

There are some things I discovered about stitching a wallet like this:

1) Don't try to make holes in all layers at once. Something will slip somewhere, and one set will be misaligned. That means a piece for the scrap box, and a lot of work wasted. (One could, of course, glue them all together first, but if you don't, then try this instead.)

2) Instead, make the stitching line on one layer, using the widest chisel (my widest is 6 points)-- overlap by at least 2 holes, or better yet 3, to keep the line straight. Pay close attention before you strike the chisel with the mallet. Next, use the stitching chisel to lightly mark both ends of the stitching line on the next layer down.

3) Using those end points, draw a light line with a straight edge which marks the next stitching line. Then make the stitching holes on that nice straight line, which lines up directly under the previous layer. Also, don't do all the edges at once. Do one, from the center to the corner, which locks down the edge. Then do the next edge, and so on.

4) Got a third layer? No problem -- just repeat the above steps, paying careful attention to edge distances.

It's also very helpful to make the inner layer slightly oversize, because it's possible to trim, but not add leather.

Here's the inside, with the card pockets on the left and right. I don't know what the white streak is on the leather, but it's there to stay.

See that one hole in the upper right hand corner? I forgot that I was going to trim that edge, so I took the stitching line all the way up. Whoops...wasn't thinking ahead quite far enough.