User named WinRAR wanted this tutorial, so, here it is!
It's absolutely easy. Just go to folder "Battlefield Heroes\bfheroes\Objects" and select what you want to reskin. If i wanna reskin weapons, i will open "Weapons_client.zip", if i wanna reskin vehicles i will open "Vehicles_client.zip". For example, i wanna reskin Thompson. So, i will go to "Weapons_client.zip\Handheld\bri_smg_thompson\textures" and open "bri_smg_thompson.dds" edit it with some graphic program, and save it ;) Also you can mix up models, if you take "GER_SMG_MP40/meshes/GER_SMG_MP40.bundledmesh", rename it to "bri_smg_thompson.bundledmesh" and place it to "bri_smg_thompson/meshes" so instead of Thompson, you will be holding MP40 ingame, changed textures and meshes are working online. :) Hope there will be lot of quality skins for BFH.