The sample to the left looks a lot like rep weave and Sue did use a thick and a thin yarn.
Then, what to do with variegated yarns? This sample proves that there can be interest. This sample also shows the striping in the warp more clearly when Sue went back to white yarn. Wouldn't this make a nice place mat?
In the photo below, notice the nice edge that the thick yarn makes along the selvedge. Wow - give Sue a warp and let her imagination take off!