For a couple of the samples I replicated the techniques on scrap fabrics, made quilt sandwiches and then auditioned stitches and threads. For other samples I did something which might be considered extravagant - I took a photograph of a work in progress and printed it out on ready printable fabric. This was a direct way of testing stitches and thread with the added benefit of creating a good collection of samples, all of which are now in my sketchbook, a permanent reminder of the works.
Some of the samples are shown below; click on each image to see a larger picture.