Here's where you need to have a good color selection of yarns at your fingertips.
If you can take one color and use several shades or tints of it, you can get nice results.
Monochromatic is defined as a color scheme using one base hue and its shades, tones and tints.
Tints come from adding white, tones from adding gray and shades from adding black.
This color wheel gives you an idea of what these combinations might look like.
In both of the following designs, I've used a monochromatic theme with 3 tints/shades of the same hue.
For the strap below I used yellow-green (or chartreuse) and two shades of it.
The shades are dark and light olive.
And below is yet another green strap, this one uses a medium green with a lighter tint and a darker shade.
FOR SIMPLICITY OF USE, CONSIDER THE TOP ROW TO BE HEDDLED THREADS AND THE BOTTOM ROW TO BE OPEN THREADS ON ALL OF THE DRAFTS.