Draw something and put in into the real world, on a wall or otherwise. You can use the perspective tool in GIMP and probably other programs. Actual IRL graffiti is also welcome!
Thread inspired by: https://firstname.lastname@example.org,-2.5611005,3a,15y,142.46h,88.31t/data=!3m6!1e1!3m4!1s8Tvda0NrE_EhwmIwHRMjVw!2e0!7i16384!8i8192
Love her. You can do better with the shop work though. More transparent and white balancing