The pink, cream and gold ring was the 1st I made and has just the 3 colours, but still works out quite nicely. The proportions can be tricky, don't use the same amounts for all colours, I found this looked a little odd and not random enough. The purple ring has 6 different shades and finishes. The brown button ring has brown as the main colour in the mix with beige and 2 different shades of gold.
I found that having one shade as the main colour (at least 50% of the finished mix) worked well and then add different amounts of related colours in different shades and finishes. One of my most successful mixes was a blue one with 6 closely related shades of teal and blue, each one a different finish, it stitched up really nicely too.
Once I had my mix I then stitched up the rings using 2 drop peyote stitch, these are 12 beads wide. I then zipped them up and added a focal.
Great little stashbusters and I think if you made them wider and longer, they would make great napkin rings!