We just finished this l 12' x 18' for Tapis & Decor in Minneapolis. We started with a Photoshop rendering to show how stripes would look on the full size rug.
In the photo below, you can see the rendering taped to the loom. This is how the weavers keep track of the stripes to create controlled variation and rhythm in width. Although I planned the blend of yellow creams and pale greys in the "white" section in the sample, I didn't expect it to be so pretty in the room size rug.