[Ranama]

There is acctually a function in Pawno to change the color of objects, you can change them to a different objects color, add text to them or chose your own color to change them with.
The functions is:
https://sampwiki.blast.hk/wiki/SetObjectMaterial
https://sampwiki.blast.hk/wiki/SetObjectMaterialText
https://sampwiki.blast.hk/wiki/SetPlayerObjectMaterialText
https://sampwiki.blast.hk/wiki/SetPlayerObjectMaterial

Hope I helped