|This article is written from the Real Life point of view|
Dioramas appear as a set of unlockables in Metroid Prime 3: Corruption and Metroid Prime Trilogy. Dioramas in this game are 3D models that can be viewed similar to Trophies in the Super Smash Bros. series. In the games, there are several Dioramas to unlock in the Bonus Gallery. The player will need Friend Credits to purchase them. The base for each is shaped like a Metroid.
These Dioramas are not considered canon to the storyline and some are completely irrelevant, as they feature settings and events that never happen in the game. The most glaring example is that Samus Aran is always depicted in her Varia Suit, despite the fact that she wore the PED Suit for most of the game.
Credits required (per Diorama)
See King Conan.
This diorama shows the battle between Mogenar and Samus (in Morph Ball form), and seems to be set in Bryyo Fire. There are several pillars with onlooking Reptilicus Hunters, and some are toppling over.
This diorama features a battle between Ghor and Samus. Several Chozo Ghosts can be seen in a circle around the battle. It appears to be set on the Main Docking Bay, where the actual battle took place.
Five of the six Dioramas were designed by Matt Manchester. Here are his notes:
"At the end of the project, I made several dioramas that could be purchased using points acquired through playing the game. These were made quickly, and use many assets created by many other artists at retro. I made the bases for the dioramas, and arranged them all into a scene, using characters made by Quinn Smith, Danny Richardson, Ben Sprout, Andrew Jones, Elben Schafers, and Ian Olsen. Sorry if I forgot anyone!"
On ConceptArt.org's forums, he had this to say about the dioramas:
"They were one of the most fun tasks in some respects. It was liking playing legos with the art assets that the whole team had built up to that point. You could whip a bunch of interesting scenes together real fast." 
- ^ Manchester, Matt (oracrest). "Also I had forgotten I made the bases a metroid shape" 27 January 2021 7:47 a.m. Tweet. https://twitter.com/oracrest/status/1354410731660337153
- ^ Manchester, Matt (oracrest). "Taking a look back at some of the unlock trophies I made for Metroid Prime 3: Corruption. I was tasked with coming up with an interesting scene for each world's dioramas. #Metroid" 26 January 2021 2:56 p.m. Tweet. https://twitter.com/oracrest/status/1354156228608483333
- ^ Pearson, Kynan (kynanpearson). "Always loved these and I remember when you were working on them soooooo long ago now. You should 3D print one if you haven’t already." 27 January 2021 12:50 a.m. Tweet. https://twitter.com/KynanPearson/status/1354305728912220160
- ^ Pearson, Kynan (kynanpearson). "I guess you built those pretty close to release so yeah, just before those memories are old enough to get a learners permit. At least those memories are modding and have shown interest in games development." 27 January 2021 8:49 a.m. Tweet. https://twitter.com/KynanPearson/status/1354426363860705281