Find one that's real basic to do that with. I did that once with a template that had a bunch of pre-configured music for the menu, thought I had gotten rid of everything to make my own pages, but after burning that blasted music was still there. I don't know why iDVD can't just offer a blank template for these purposes.
However, it's just about as easy to do a Q&D DVD, without any canned themes or the need to delete them, in DVDSP, and with a lot more control if you want it.
Scott