We now have an excellent floor designer that you can use to design your floor! In the designer, you can figure out how many edges you need and how many of each color. As well as play around with the design to see what you like.
All you need is your dimensions, draw out the pattern you want, and then it spits you to the checkout page. Since you'll be making cuts around the walls, you may need some extras in case of a mistake.
Check out the Obsessed Garage Floor Designer
We have also made a video to help you out in this process:
How To Design Your Dream Garage Flooring - Using Swisstrax Designer Tool