A YA book I've read that features spray cans and tags is HE'S AFTER ME by Chris Higgins. The blurb on the back cover says:
Anna meets Jem when her life is falling apart. And he's everything Anna needs him to be. As long as she has Jem, she knows everything will be OK.
But Anna's about to find out that not all love stories have a happy ending...
This book also gets a thumbs up from me.
Do you have any street art where you live? Do you consider it graffiti or a work of art?