Dota 2 menu backgrounds
The background behind the main menu, which is the screen you look at more than any other and the one Valve gives you least control over.
The D2PFX catalog has 70 mods in this category. Each changes what you see on your own screen; everyone else sees their own game.
Gwardjan Tad Dawl Perfezzjoni
The Great Awakening
Xvii
Bliss
Taghmel Ix-Xita
Dark Tree
Sematary
Amor Endscreen
Illidan Stormrage
Beneath the Seventh
Malenia
Last Match
Sora
Watermelons
Ken Kaneki
Sea Of Flowers
Experiments Lain
Froglings
Light Yagami
River Vials
Shadow Fiend
Windranger
Grave of the Fireflies
Nemestice
Sky Trees
Stars
Guts
Knight Artorias
Minecraft Rain
Old Bus Stop
Pine Forest
Sakura
Station
Winter Forest
Cat Under Rain
Corgi Sleeping
Fallen Paladin
Floating Dog
Garden of Quiet Days
Nikaido Hiro
Blossom Rem
Brewmaster
Cloudy Tree
Code Geass
Cyrene Song
Dead Eyes
Depressed SpongeBob
Field Grass
Forgotten Sword
Ichigo
Kakehashi Subaru
Katana In Forest
Kira and Ryuk
Kurumi Tokisaki
Lelouch Lamperouge
Liberalio Nikke
Lonely Quay
Moonflower Field
Nier Automata
Rainy Girl
Rei Ayanami
Sad Maomao
Sajin Komamura
Shadow Wreck
Snowfall In Forest
Ulquiorra
Ulquiorra Purple
Winter Solitude
Yuno Gasai
Zenitsu White
Installing any of these
Open Dota 2 Mod Manager, find the hero, press Install. The app puts the file in a free pak slot in the folder your game mounts, tells you when two mods carry the same file, and puts everything back after a Dota patch. The full guide, or the manual route if you would rather do it yourself.