Check out these colorful map designs generated from OSM data.
Already mentioned in
http://www.weeklyosm.eu/fr/archives/4870
and
http://blog.openstreetmap.de/blog/2015/09/wochennotiz-nr-268/
So tell us new things … 
MapOnShirt has just launched an Indiegogo campaign:
https://www.indiegogo.com/projects/maponshirt-be-unique-with-custom-map-wear#/
New enough?
I’ve already bought one of their shirts before the campaign, btw. It’s pretty great quality.