Ask HN: App clearinghouse/graveyard?

I have a client who wants to quickly put an (iOS) app together but doesn't have the resources to build one. So they'd like to take an app that didn't quite make it and re-brand it. Most likely a game that they could replace with graphics, etc.

Ignoring the business-sense of this approach, is there a place where apps go to die? I'd imagine just going through the app store, finding free apps and then contacting the developers, but is there a "stock photo" place for applications? many thanks!