I got a shelf that's got Marty Jr.'s hat, the Sports Almanac, the OUTATIME license plate off the DeLorean and a shotglass from Biff's Pleasure Palace on it.
Another shelf has Hasbro versions of Anakin's, Obi-Wan's, Yoda's, Luke's, Vader's, and Kylo's lightsabers (also Kanan's and Ezra's even though they're not technically movie characters), as well as Nerf versions of Chewie's bowcaster, Han's and Rey's blasters, and a First Order Stormtrooper rifle, as well as a helmet for the latter. I don't tend toward the super-expensive collector stuff.
The tops of two of my drawers have versions of various Transformers live-action movie figures, most of them with G1 decos but not all: Grimlock, Slag, Sludge, Starscream, Soundwave (DOTM), Shockwave, Thundercracker (Studio Series), Megatron (TLK), Hound, Ratchet, Bumblebee (AOE High Octane mode), Optimus (AOE Evasion Mode), Wheeljack, and Sideswipe. Also I've got an Optimus Voice Changer helmet from the first film and a role-play Optimus sword from the second.
Also, not technically movie-related although it did have a theatrical release, quite a bit of Batman '66 stuff - the LEGO Batcave with the additions of the SDCC exclusive Mr. Freeze and LEGO Batman Movie King Tut and Egghead (I also threw in LEGO Batman Movie Dick Grayson's Shark Repellent Bat Spray in the Batcopter); Mattel's Movie Masters and Funko Pop figures; and the Pin Mates.
Oh, and another shelf has a bunch of Bandai 6-inch Godzilla figures, mostly from the Heisei and Millennium films.
As for posters, I've got Jaws on my old bedroom door, a Raiders re-release poster, a replica door poster for Godzilla, King of the Monsters!, a mini-poster from American Graffiti because I loved Mort Drucker's work from MAD Magazine, and mini-magnet versions of the posters for Goldfinger and Live and Let Die.