Here's what you probably want to consider:
You need photoshop or sort to do some of your own menu, button design, you need a video editing program to create looping background of your own, and you need a dvd authoring program to put them all together
For PC
Photosohp for design
Premiere Pro or Vegas for creating loop video clips
Ulead DVD Workshop 2.0 or Adobe Encore 1.5 are good for dvd authoring where you can use ur own menu, design, button, object, etc.
I use Ulead DVD Workshop 2.0 a lot and my latest dvd for A Joker's Card contain a lot of personalized menu, design, loop, opening sequence, menu to menu sequence, etc.
Johnny