Maybe consider some of these. No pressure, game development can be hard.
Items/objects/tools:
- Custom kerfur colors
- (Funny setting) Body pillows with custom textures (don't judge) (trust me)
- Motion sensing camera that records for 30 seconds when it detects motion
Events:
- Wormhole that randomly spawns on the map and sends you to a different spot on the map.
- Eclipse that increases paranormal activity.
- A deer/moose runs between two bushes. Kind of like MSC.
Misc:
- Hand print on basement freezer window
- Custom skyboxes
- SMAA/SSAA/MSAA. FXAA and TAA are, imo, some of the worse anti aliasing. Not your fault, they just look terrible. Idk if UE4 has a easy way to make better AA however.
- Anisotropic filtering
- Twitch integration into cams. (The stream is from the POV of a camera)