I don't like the mess of normal immersion dying, so to dye the twill I first dampened it with water, then pressed it into three different colors of Tim Holtz Distress Ink pads. To finish the job, I spritzed the twill to re-wet it and rubbed it with my finger to blend the colors.
For the SU stitched ribbon, I just ran it across one of the Distress Ink pads to "age" the white stitch thread.