The first time I went to Berlin, I instantly loved the pattern on the U-Bahn seats. I took a photo and traced it when I got home. I've been playing around with it ever since.
BERLNZ 01
BERLNZ 02
BERLNZ 03
BERLNZ 04
BERLNZ Outlines 01
BERLNZ Outlines 02
BERLNZ Outlines 03
BERLNZ Outlines 04