Display Suite has the ability to create custom fields, either through code or via the UI. Those fields can hold custom content or even PHP code. It is somewhat limited since one field can only have one type of content, unless your field has some crazy PHP code which is not easy to maintain. Those days are over now. You want to add custom content, a node, the logo or any other type on the Field UI screens? The upcoming release - 7.x-1.2 - comes with a new field called ctools field, which can hold any sort of content that is available through ctools' plugin system and which is configurable on the "Manage display" screens per entity, bundle and view mode. Think as of Panels, but in Field UI. And they are of course all exportable. This may all sound a bit cryptic to you, so I've recorded a screencast showing you how this works. Be amazed and watch out for the upcoming release of Display Suite somewhere next week!