;_;
I wouldn't expect Rampage to have much of a room, but if he had one and his stuff wasn't in danger of being destroyed by Megatron, I think he'd keep it pretty bare, since he doesn't see much use in keeping random things about and I don't think he attaches himself to things easily. He never had to and was never taught to, theoretically.... However, there might be a few things he likes or means something intensely personal to him that e keeps. Like some Transmutate parts. Or something.
However, if he'd want to keep something but not have it in danger, he might keep it some place secret outside or in the ocean. :/
Depth Charge hopped down into that little cave in Feral Scream where he scanned the TM Driver. That room looked covered in tech that might have been recovered from his ship. I've thought that maybe that was his room, cuz it was so out of the way and the computer sounded just like his personal computer. So maybe DC's room would be covered in tech, especially tech that would help him catch/kill/track Rampage.
Rhinox's probably has lots of spare parts, tech, trinkets, parts and things he knows will be destroyed somehow or by someone anywhere else on the ship, AND FLOWERS!
I picture it being very organized with a work in progress on the worktable or something. omg I think Rhinox might have gotten along with Botanica nicely.
Hmm... Terrorsaur....uh...Hm...I think his room might be mostly bare except for things he uses. I can't see much decoration, since we don't know enough about him to assume what he might like. But he might have a pic of Cybertron or something. I also picture it being pretty organized, since flyers like Starscream always seemed finicky to me about neatness. But not obsessive - I can easily see Terrorsaur leaving his room a mess sometimes. He also didn't seem too fond of tight places, like in the episode Victory. :/ He was disgusted by everyone being in one place and Tarantulas drooled on him, of course, but I think his flipping out was more about getting out of there, which seemed to point to claustrophobia to me.
So maybe he keeps a nice, wide open, clean room. xD
Inferno....bare as far as personal things go....but he probably has STACKS of guns, explosives, flamethrowers, and stuff.
OMG TARANTULAS! lol!!! Now, he has his lairs, but what does his ROOM look like? Uhhh.... I'd say, first of all, I'd never wanna be in there.
Second, maybe it's cluttered but packed with important notes and stuff, all stacked an packed away around the room. With projects and spare parts and beakers on his desk and shelves. His bed would be creepy and probably booby trapped, with a web somewhere, possibly in the upper corner. And under the bed.....is a strange, pungent, sick smell, like remains of stuff he's eaten rotting away before he gets around to cleaning it out. A few times in the show, several people mentioned that he "stinks." I can only imagine he stinks from death and/or they mean it figuratively. I think spiders are clean creatures - they can't afford not to be. :/ They don't want their prey smelling them and running away or their lairs to be found. So I think he might smell a little bit, but I would think that he'd clean his general vicinity every once in a while.
Hmm....
), Megatron's jazzucci and rubber ducky to Cheetor's pictures and models.
This egg has a Predacon symbol, yess. 
Maybe slabs of skin, or something disgusting... lol.