Everything is customizable with the Dota 2 Mods Cheat, including the terrain, effects, loading screens, and hero items and sets. You just cannot afford to acquire every one of the hundreds of hero sets and equipment, but it would be awesome to see them in action. Since mods don’t impact the game’s economy and are only visible to you and not other players, Valve permits them.
What skins or Dota 2 Mods Cheats are you able to use, then? Anything manufactured is OK. Hero Sets, Immortal items, and Arcanas are a few examples. Not to mention the terrains, weather, music, announcers, item effects, skins for Roshan, and everything else.
There are still more custom mods created by modding enthusiasts, though. Simple recolors of existing things, completely new objects that are rejected by Valve, or models from other games can all be included in these custom mods.