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 the annex area where Honey and Hotsauce sit together, interact with the DJ table and sit on Hotsauce, then cross the bridge that appears to the east. | 
|
| Dusk | 
|
NacreMoon | Dusk World | None | 
|
| Vague Memory | 
|
NacreMoon | A Long Journey | Interact with the Girl at the Crossroads to cause her to disappear, then return to the western end of the world. | 
|
| Squids | 
|
NacreMoon | Squid Paradise | None | 
|
| Willow | 
|
bWF5 | White Lotus Islands | None | 
|
| Vibrant Blue | 
|
Delly | RGB Sewers | None | 
|
| Glitched Static | 
|
Delly | RGB Sewers | There is a 1/5 chance for the entrance to the room the menu theme is in to be present (rolled every time RGB Sewers is entered). | 
|
| Ammolites | 
|
NacreMoon | Mollusk World | None | 
|
| Box Office | 
|
Roninnozlo | Box Office | Complete all the Box Office puzzles and interact with the Ludovico Minnatsuki at the end. | 
|
| Mural | 
|
rollaby | Mural Passage | Kill Tusuq Warmi (requires the Soulfire eidolon) and activate the switch in the room behind them while the lights are off. Both menu themes are 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 | The entrance to backstage has a 50% chance of being present (determined every time the totem in Minnatsuki's Room is activated to enter the spirit realm). With this entrance present, get all six Sugarcube Troupe performers on the stage, access backstage (through the mouth to the left of the stage), equip the costume, interact with the stage, and return backstage. | 
|
| Blueing Plastic | 
|
VoxlAlien | Petscii World | None | 
|
| Voidbound | 
|
RM824 Somnium | Void Cenotaph | Solve the puzzle in the fountain branch of Void Cenotaph and visit the room with the two flickering statues. | 
|
| Handheld | 
|
Mooncaller | GBC Village | None (located in a secret passage) | 
|
| Sidereal | 
|
Delly | Starry Docks A (Variable 30 < 128)
OR Starry Docks B (Variable 30 ≥ 128) |
The blue star node granting access to the menu theme is randomly found in one of the two areas of Starry Docks (chosen every time the totem in Minnatsuki's Room is activated to enter the spirit realm). | 
|
| Golfer | 
|
Dohus | Mini Golf Maze | Complete the mini golf course. | 
|
| Virtual | 
|
Delly | Virtual Nightmare | None (located in a secret passage) | 
|
| Orchid | 
|
orchidmantis | Streetlight Path | Purchase from the Menu Theme Seller (requires 500 Luna each). | 
|
| Streetlight | 
|
| |||
| Basalt | 
|
| |||
| Metal | 
|
Delly | Cave | Purchase from the shop while the Ghost Clown is running it (requires either the Spectral or Youth eidola to access and 1000 Luna to purchase). Soulfire or Lumen eidola recommended for visibility in this world. | 
|
| Charred | 
|
Delly | Scarlet River | Enter the ritual room and kill Tauros (requires the Soulfire eidolon). | 
|
| Chromatic | 
|
BlackMamba | Chromatic Slabs World | None | 
|
| Mossy Lab | 
|
NacreMoon | Mossy Lab | None | 
|