This is a simple stationary design based on geometric triangles in the shape of an arrow. It has a blue palette, but is fully customizable for other color choices. This is an example of what one could do for different stationary items. This would easily let your customer know who sent the items.
I have been working on a few different design elements lately, and this one came as I was working on a roll-up banner, which was also based on geometric triangles. I had decided that the triangles were going to make an arrow, but I was not quite sure how I would accomplish this. I did a few sketches to figure this out. Once, I got a design that I was happy with, then I created the final product using Illustrator.
The blue color palette used was: #005073, #107DAC, #189AD3, #1EBBD7, #71C7EC.