I love using Variegated threads and have stitched out many of my designs using them.
I use Variegated threads from Theda Threads.

Janka who is the owner of Theda Threads has used some of my designs to display
the colours on her website.
Below are the sets that have stitchouts using Variegated Threads.
Some of the pages will have a link towards the top that will open a page
with only Variegated stitchouts on.