MOD: "Your own photo to car/trailer"

is it possible to add a mod that can add your own photo to car or trailer

 

i can make thesee skins they are very very simple

 

Y'know, you could've done that by yourself rather than editing it-

 

Yes it's very easy.
There's tutorials on youtube about this, just find the most recent video as there could have been changes a long the updates.
It's called a skin.