I don't know if I am sophisticated enough to have a trade secret, the Three button's This is suggestion from bollewangenhaptoet, though I do think that Miss Three button's summed it up perfectly.
I have found that covered buttons are great to have in my sewing artillery. It means no matter what fabric I have something that compliments and I don't have to run to Spotlight every week. They are also fairly reasonably priced if you buy in bulk. I just got some from this lovely lady with free shipping - yeah - I hate postage.