I have decided to use cotton floss, mostly DMC, for my second sampler which, at this stage, is looking at buttonhole stitch - of course, this is liable to change at any time.
I used mainly perle cotton, my preferred thread, for the first sampler. However, my range of perle colours is very limited while I do have quite a nice range of cotton floss colours, leftover from those cross stitch days. So I could find some really nice colour combinations. This is not a bad reproduction of the floss colours except for the greyed greens which look more grey than they actually are. I don't know how to improve this, unfortunately. Colour play is always fun - now I only need to stitch!