I don't know shit about modding, but I can do some things with gimp. Otherwise I would probably just made a mod adding these to the game (after seeing how the work in-game). Use these if you want, credit me. (Also if you need something looking like these for a mod, contact me and I might be able to figure something out, yeah?)
Credits:
Brushes
Tattoo brush set by luther1000
Fantasy set 2 mega pack by mawson
Skullribbles by KeepWaiting
Images
Gun + Wrist by dezkate
Dump Your Toilets by brbankston
Eat The Rich Graffiti by pygment2
Need Help by ortonesque
Lovepain by ericmilet
Pray for Pills by mbacina
Graffiti Eye by berkeley
Skull by sucrerose
Bleeding Heart by lacejones
Fonts
DJ Gross
Jenna Sue
Windsor Hand
GONG!
Take Out the Garbage
A Dripping Marker
Mari & David
Easy going
Throw my hands up in the air
October crow
Old press
New press eroded
Amatic
Skinny
Daniel
Belligerent madness
Good dog
RapJack
Fish Fingers
Slammer Tag
Elmar's Scratch Type
Credits:
Brushes
Tattoo brush set by luther1000
Fantasy set 2 mega pack by mawson
Skullribbles by KeepWaiting
Images
Gun + Wrist by dezkate
Dump Your Toilets by brbankston
Eat The Rich Graffiti by pygment2
Need Help by ortonesque
Lovepain by ericmilet
Pray for Pills by mbacina
Graffiti Eye by berkeley
Skull by sucrerose
Bleeding Heart by lacejones
Fonts
DJ Gross
Jenna Sue
Windsor Hand
GONG!
Take Out the Garbage
A Dripping Marker
Mari & David
Easy going
Throw my hands up in the air
October crow
Old press
New press eroded
Amatic
Skinny
Daniel
Belligerent madness
Good dog
RapJack
Fish Fingers
Slammer Tag
Elmar's Scratch Type