Designers may use any kind of association with the city Cologne itself, the special location where the event is held (Rhein-Energie-Stadion), the SEOday mascot or other designs related to SEO (search engine optimization)
In the neck of the shirt it should say: Designed by 99designs (you can either just use typo here or use the 99designs logo)
Attached you'll find some pictures of the past designs with the city of Cologne and the mascot. As well for inspiration pictures of cologne and the stadium where the event is happening.
Lo que debe evitarse
What I noticed looking at some of the first entries: Please don't make it look like a religious design with crosses, etc. and overuse the cathedral too much since it doesn't really fit to the event. Thanks!
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