You know I'm actually gonna chime in on one of these threads with a suggestion.
It would be nice to see more ideas for SCPs from series 3, 4 or even 5 once it's open. atm CB doesn't include any SCPs from these series so it'd be great to see if there are some more recent articles that could work in the game. I mean another round of 009/178/457 suggestions is neat I guess but there's probably better ideas out there.
SCP-3106 seems like it could be a neat puzzle element. There could be a few instances of them that roam around the facility, maybe requiring you to distract them with body parts you can find (the severed arm anyone?).