In short, repurpose the disposals room by turning it into a small museum/easter egg room. It's no secret that it won't be a commonly visited area of the ship, and I think we could have some fun with it.

The recycle room from Goonstation.
Examples of some objects that could be present:
Wrecked M577 APC (sprite WIP)

(basically a nice IC reason as to why the marines don't have a working APC)
New Years 2073 banner

(Left over banner from that new years party six years ago.)
Old propaganda posters

Other objects:
*Spare ammo
*Sheetmetal, tools, items used in construction/engineering
*An old set of marine armor from the days yonder (using the old sprite)
*Items that some players want to be included but don't have a place (IE Camera)
*Cassete tapes? Old Computers? Arcade machine?