For this stitch my conclusion is that you have to check the tension so the stitches sit nicely. Open Chain Stitch can also be used in a more folksy, rough form, as seen here:
I can't say I like the design but it was fun to make.
Each three rungs of the 'ladder' of the Open Chain Stitch are bundled together, similar to the way you create a Sheaf Stitch.
With a piece of white card inside I made both these samples of Open Chain Stitch into small greeting cards. This is how I mount my cards.
I will add a small brooch in the centre of this one.