Well, I've had some amazing inspiration for this, my newest project--Button Card Jewelry.
I have made pendants and pins that look like vintage button cards--complete with little buttons (some of them very tiny).
Using the digital tools available today and vintage cards and things, I've made pieces that look like vintage button cards and sewn on buttons (many of them vintage) turning them into brooches and pendants. They have been a lot of hard work but great fun.
Of course, much inspiration has come from following Button Floozies, a blog that I adore. Pinterest has been another source of inspiration with photos such as this:
Then, there was the article in the March 2013 issue of Romantic Homes. I just LOVED the picture in it and was drawn to the colors on this page.
I haven't copied any button cards actually but rather have created my own and coordinated buttons to go with them. Hope you like them! They are listed in my Etsy shop.