These cards use a Hostess Level 1 stamp set called Darling Dots (view all images below). You cannot buy this set, however, you can earn it.
To see how you can get this set (and all other Hostess sets) view my "Be a Hostess" page.
NOTE: You do not have to hold an actual party in your home to be a hostess. You can place a qualifying order yourself or just gather orders from friends.
If you are interested in either of these options, please Contact Me. If you are in the Madison, Wisconsin area - I will gladly demonstrate Stampin' Up! products for your party.