1. The uplifting compliment.
2. The helpful reminder.
3. The one-word instruction.
4. The vision of racial harmony.
5. The polite request.
6. The wise mantra.
7. The delightful daubing.
8. The recipe for a better life.
9. The heartening epigram.
10. The gnomic statement.
11. The spectacular proposal.
12. The quiet note of solace.
13. The pithy aphorism.
14. The unusually expressive traffic lights.
15. The uplifting mural.
16. The naughty suggestion.
17. The philosophy to live by.
18. And the always-welcome encouragement.
Most of these photos are courtesy of Happy Graffiti. There's a book, too: Happy Graffiti by Jenny Foulds, available here.