Some excellent interior decorating ideas are from mods on the nexus. Check out the images tab on these mods sites. Especially the pre-war textures that mods like Alternative Settlements (adds high res, custom pre-war textures for walls and floors) and Homemaker Expanded (unlocks pre-war/Institute objects and textures) add to the game. The customized textures alone that Alternative Settlements adds to my existing settlements, upped the level of immersion in my game. Some settlements are pure Megaton shanty towns, while others are a mix of current wasteland and prewar. Sanctuary is my largest and most established settlement with the unique distinction of being my PC's former home. Because of this unique distinction, I've been gradually rebuilding it with 100% pre war/customized pre war textures, and Institute/prewar objects and furniture. I've been slowly transforming it into a living pre-war museum of sorts. And so Sanctuary and its citizens are fast becoming the new Diamond City of the Commonwealth in my game.
Sanctuary Hills is fast becoming the Commonwealth's cosmopolitan hub--where all those snobby and wealthy NPCs at Diamond City would sell their souls to a Deathclaw just to live there.
Anyhow, to get some amazing interior design ideas, check out the pics for these mods on Nexus. Especially Alternative Settlement custom textures and Homemaker's unlocked objects. Homemaker allows you to grow crops in planters, which makes it possible to sustain a sizeable population at a settlement like the Airport which has no farming terrain. It will be fun to see what people will come up with once CK is released for the game this year.
Alternative Settlements
http://www.nexusmods.com/fallout4/mods/5118/?
Homemaker Expanded
http://www.nexusmods.com/fallout4/mods/1478/?
safe Ssix
http://www.nexusmods.com/fallout4/mods/1145/?
I'm still trying to understand why Beth didn't consider unlocking and adding prewar/custom prewar texture sets to the game. Then again, Beth might be planning on releasing custom content like this in the form of a Hearthfire styled DLC for game couple weeks from now.