To go along with @Xaldafax’s suggestion for an in-game journal that you can take notes in, I’d love to see the ability to take simple photos in-game. I’m aware you can always take screenshots with Steam or with your OS but what I’m referring to is an in-game photo mode where it hides the UI (if you’d like) and allows very basic controls around the photo such as controlling the camera a bit including zoom and rotation. At minimum, just taking in-game screenshots would be sufficient.
These photos would then either be sent to your inventory as items you could use to decorate your builds or, to my original sentence, could be dropped into the aforementioned journal. For example, consider you want to document your journeys in Boundless and come across a really cool build. Enter photo mode, take a cool pic and then jot some notes in your journal while dropping the photo in.
If we want to take it even further, we could tie this into a UI for characters that is visible to any players who interact with you thus allowing other players to read from your journal if you permit it. This could add a nice RP aspect to the game.
Really, I believe it would help us help the game: virtual photography is becoming more and more a thing, has a great community on Twitter, a lot of folks who I believe would love Boundless and be great additions. We could better show them the beauty of Boundless.