Well, the samples are done, but I've not been able to figure out a way to get them on my website without waaaay more work than I want to do! So, I'm posting it here, FYI. I hope this will be of use somewhere/somehow. These samples are on 18-count canvas and are mostly threads that cannot be stranded.
Of course, there are many other threads that will work. If you choose stranded threads, there are many more choices available, including all the cotton & silk flosses and crewel wools. They must be laid carefully. Number of strands needed will vary by brand and desired coverage. Many of the ribbon type threads, such as Rainbow Gallery's FyreWerks and Neon Rays, and the ribbons by YLI work well. They also need to be laid carefully, sometimes on the back as well as the front. 1/8 ribbon is generally too wide, 1/16 works well.