This is my entry. A full description of the design please see my post. The full size 1000 px square .png is in in my post, or I can send it on request.
https://steemit.com/art/@the-fillosopher/blocktrades-logo-challenge

Basically I used turned the blocks into diamond shapes and used them to create an illusion of arrow in motion to represent speed. Below is a screen shot, many more in my post if anyone would like to see.

Thanks, I had fun with this.