This is cool. This person did something similar on a bike:
<a href="http:&#x2F;&#x2F;rideallofsf.tumblr.com&#x2F;" rel="nofollow">http:&#x2F;&#x2F;rideallofsf.tumblr.com&#x2F;</a>
(go back a page or so, the project finished a while ago and it has since devolved into Strava drawings)