I have uploaded a Blank Mini Card Template on my website : Adityastar.com which you can get by directly this link : Mini Card Template
you can use these cards in many ways. For example you can print out the template on back of pattern paper and then cut out and stamp to create mini cards with some quote or stamp. Or you can edit the pdf file using photoshop to create your logo and then create your own branding cards. Possibilities are many.
Here is image of what I made :
I use them for branding, bookmark and also to give as simple business cards.