According to this article, a 33 year old French pilgrim on the Camino Primitivo has been arrested for painting his particular sign (roughly the infinity sign with an arrow going through it) on numerous signs and camino mojones (I think the word is bollards). Some pictures and the full article here:
http://elprogreso.galiciae.com/nova/350662-imputan-peregrino-frances-pintar-mojones-camino-primitivo
No objections from this peregrina!
http://elprogreso.galiciae.com/nova/350662-imputan-peregrino-frances-pintar-mojones-camino-primitivo
No objections from this peregrina!