Heya Bonnell,
Thanks for reaching out! Unfortunately OBS no longer accepts game submission ideas. As an independent developer, Obsidian was often contracted by publishers with an idea for a game and make it through them. Now that we're part of the Microsoft family, it's a bit different. That said, you can reach out to developers with your idea and see if they're interested. They would be the ones who in turn approach publishers like us to make the game. The developers we've worked with in the past are:
- Disney (Star Wars: Knights of the Old Republic II) - http://help.disney.com
- Wizards of the Coast (Neverwinter Nights 2) - https://company.wizards.com/contact-us
- SEGA (Alpha Protocol) - https://support.sega.co.uk/hc/en-us/requests/new
- Bethesda (Fallout: New Vegas) - http://support.bethsoft.com/form.php?l=en
- SQUARE ENIX (Dungeon Siege III) - http://support.na.square-enix.com/contacttop.php?id=1373&la=1
- Ubisoft (South Park: The Stick of Truth) - https://support.ubi.com/en-US
- Paradox (Pillars of Eternity, Tyranny) - https://www.paradoxplaza.com/support
- My.com (Armored Warfare) - https://support.my.com/games/kb/AW
- Versus Evil (Pillars of Eternity II: Deadfire) - http://versusevil.com/contact/
- Private Division (The Outer Worlds) - https://www.privatedivision.com/contact/