From Starbounder - Starbound Wiki
Graffiti (skull) is an object unobtainable by players through normal means. This item's information is present in the game files, but not intended by developers to be in players' possession.
Graffiti is a decorative object found in Human Prisons. It breaks when dislodged, so the only way to gather this object is using admin commands.
|Apex :||It looks like a human skull.|
|Avian :||A skull. Is it a warning?|
|Floran :||Floran likesss this drawing. Great artisssst.|
|Glitch :||Observant. A crudely-drawn human skull.|
|Human :||Another striking piece of street art.|
|Hylotl :||The artist was clearly inept.|
|Novakid :||A skull. Either it's a warning... or there be pirates here!|
- Perturbed Koala: Added
- Spirited Giraffe: Adjusted price