First you need photoshop or a similar program.
1. Download

2. Download unpacker tool

In the unpacker tool there is a readme file with how to do it.
Where to find the stuff?
Armor skins are in ..\RF FOLDER\Character\Player\Tex\
MAU skins are in ..\RF FOLDER\Character\Unit\Tex\
Monster skins are in ..\RF FOLDER\Character\Monster\Tex\
Weapon skins are in ..\RF FOLDER\Item\Weapon\Tex\
Jetpack skins are in ..\RF FOLDER\Item\Armor\Tex\
Grade skins(Int/SI/Leons/Relic) are in ..\RF FOLDER\Chef\GradeEffect\
Lazy? download textures from here:



Screenshots are from my launcher version1, version2 are a bit more detailed and got bether skinns.






