Scattered throughout the spirit realm are a number of Menu Themes that players can use to change the look of in-game menus. The selected menu theme will also change the appearance of the YNO website where Collective Unconscious is played. Most notably, a player's username (in the game's text chat) and nameplate (in the game's user list) will be colored according to that player's selected menu theme.
Menu themes can be selected in the 5 tab of the journal in Minnatsuki's Room. Like Book Covers, menu themes are purely cosmetic and have no effect on gameplay.
| Name | Icon | Author | Location | Condition(s) | Image |
| Default | 
|
Noahrav & Loriesquare | None | Unlocked by default. | 
|
| Classic | 
|
Led | 
| ||
| Office | 
|
maple | Smiling Pen Office | None | 
|
| Sun | 
|
MillieAmp | Burning Building | In Honey & Hotsauce's area, interact with the DJ table and sit with Hotsauce, then cross the bridge to the right. | 
|
| Dusk | 
|
NacreMoon | Dusk World | None | 
|
| Vague Memory | 
|
NacreMoon | A Long Journey | Interact with the Girl at the Crossroads until she disappears, then return to the beginning. | 
|
| Squids | 
|
NacreMoon | Squid Paradise | None | 
|
| Willow | 
|
bWF5 | White Lotus Islands | None | 
|
| Vibrant Blue | 
|
Delly | RGB Sewers | None | 
|
| Glitched Static | 
|
Delly | RGB Sewers | Random chance of the room the menu theme is in being accessible (Rolled every time the world is entered). | 
|
| Ammolites | 
|
NacreMoon | Mollusk World | None | 
|
| Box Office | 
|
Roninnozlo | Box Office | Complete all the Box Office puzzles and interact with the NPC at the end. | 
|
| Mural | 
|
rollaby | Mural Passage | Only available in the room past Tusuq Warmi (requires Soulfire eidolon). Obtained simultaneously. | 
|
| Neon Mural | 
|
| |||
| Altered | 
|
NacreMoon | Altered Plains | None | 
|
| Glowing | 
|
orchidmantis | Glowing Path | None | 
|
| Sunset | 
|
orchidmantis | Sunset Woods | None | 
|
| Celestial | 
|
orchidmantis | Celestial Platforms | None | 
|
| Sweet | 
|
Proton | Sweets Circus | Gather the performers, enter the mouth area (random chance to appear), equip the costume mask and interact with the stage. Afterwards, go back into the mouth area. | 
|
| Blueing Plastic | 
|
VoxlAlien | Petscii World | None | 
|
| Voidbound | 
|
RM824 Somnium | Void Cenotaph | Complete the puzzle in the fountain branch of Void Cenotaph and visit the room with the two flickering statues. | 
|
| Handheld | 
|
Mooncaller | GBC Village | Requires access to the larger dungeon, in a hidden passage (But otherwise None) | 
|
| Sidereal | 
|
Delly | Starry Docks A (Variable 30 < 128)
OR Starry Docks B (Variable 30 ≥ 128) |
The menu theme is randomly found in one of two worlds (Rolled when entering the Spirit World). | 
|
| Golfer | 
|
Dohus | Mini Golf Maze | Complete the golf maze. | 
|
| Virtual | 
|
Delly | Virtual Nightmare | Hidden passage (But otherwise None) | 
|
| Orchid | 
|
orchidmantis | Streetlight Path | Find the house of the Menu Theme Seller and buy it there (requires 500 Luna each). | 
|
| Streetlight | 
|
| |||
| Basalt | 
|
| |||
| Metal | 
|
Delly | Cave | Purchase from the Ghost Clown's shop (Requires either the Youth or Spectral eidola as well as 1000 Luna). | 
|
| Charred | 
|
Delly | Scarlet River | Enter the ritual room (requires the Soulfire eidolon) and kill Tauros. | 
|
| Chromatic | 
|
BlackMamba | Chromatic Slabs World | None | 
|
| Mossy Lab | 
|
NacreMoon | Mossy Lab | None | 
|