gDAM
Idea 001 - A digital asset manager than uses your Google Drive for storage
Even after 3 years of running an agency, I still find Google Drive incredibly cumbersome and clunky to use. The inability to duplicate a folder in the web gui is aggravating in itself. I don't want to pay for a DAM that uses their own storage while the 32 TBs of space we pay for just sits empty. Give me a nice UX layer on top of Google Drive with solid client sharing permissions and I'll throw money at you.
Alternatively, you could probably build this out as a Chrome extension where it injects CSS and Javascript to modify the overall UI experience. Google's Drive API is pretty expensive by the looks of it, so making this actually might not be THAT feasible.