After making the case that graffiti is just another form of calligraphy, which we'll call graffigraphy, it stands to reason then, that there would also be artists making Abstract, Graffigraphy.
A good case in point would be the work of West One.
I came across his work at the Galerie Magda Danysz quite a while back, but couldn't find out much else about him and wondered if he had just dropped out of the scene. This time 'round though, I came across this short piece in HypeBeast and he's doing just fine. Like many other graffiti artists these days he's learned how to join the system and turn a pretty penny.
You'll find a great slideshow of his work, including installation shots, Here.
When you visit his Website, check out Walls and Trains.
Top image from westonefc.com.
Bottom image from Hypebeast.