At my first job, towards the end of the month, we'd have a few days of free time. The art director found a prompt, challenging the designers to create a simple branding concept for an English coffee shop, Coffee & Co.
The design challenge was held over three days, with the prompt calling for a Logo, a Packaging Design (for a disposable cup), and a poster that would advertise for them on bus stops, and metro platforms. The prompt was very open ended and allowed for flexibility regarding colors, fonts, and style.