To start, I drew lo-fi wireframes for different ideas of how the app could look. Since our original idea was a big button, my first sketch was of a skeuomorphic button with the phrase "What's happening?". When a user started typing, the phrase would disappear and their beacon would be written in its place.
Then, as a group we played around with other ideas for the name, and words that sounded good together. Another word we liked was "beckon", with its similarity in sound and syllables to "beacon". and I tried encorporating it into my next design.
I thought about how users would want to know they were receiving beacons or not, since the technology would work with their app closed and screen off. I believed users would also want an easy way to turn it off, in case of meetings or classes. This design featured two buttons — now rectangles instead of buttons — that controlled receiving notifications (beacon) and sending them (beckon). When pressed, the beacon button would pop up a pulsing radar image, and when beckon was pressed, it would open a "What's happening?" box like the first sketch.
All this can be seen on the first page of my sketches.