The goal of frequently.at is to rid the world of those pesky lunch punch cards and replacing them with something everyone carries with them, their mobile phone.
Both consumers and service industry business owners.
This is a pretty open field but things that should be considered while creating the designs:
I intend to use this design on multiple mediums (print, embroidery, etc) so no transparent gradients please.
I prefer clean, uncluttered design, logos I tend to appreciate the most make excellent use of negative space and the more clever the mark (takes a second glance to 'see' it) the better.
Use of a fun/modern color palette (within reason as this is meant to appeal to both male/female consumers as well as business owners) is recommended as this will also likely determine the color palette for the entire brand.
I don't think an illustration-heavy mark is required as much as well thought-out font, color, and overall design. However, I have an image in my head about using the '.' to indicate that you frequent a business.
Theoretically it could be something as simple as Foursquare or Facebook, but something that lends itself to smaller versions or a memorable iconic version will be highly considered.