I had a hunch that the background design for menus in Toast 6 must exist as a tif or jpeg somewhere inside of the Toast package. I was surprised to find that, actually, it's a PSD (Photoshop) file -- and it's not just the background, either! It also appears that Roxio intended to include different "Themes" in Toast 6, but didn't complete them.
By manipulating the ocean.psd file found in: Toast (control-click and choose "Show Package Contents") -> Resources -> Themes, you can completely change the look and feel of the DVD menu background, preview chapter buttons, and titles.
Read the rest of the hint for the how-to...Now, a description of the layers:
I haven't gone very far with this -- only moving the images around and changing the background, but I suspect you can change the font type, size, color and alignment -- as well as change the black "image" layers to be different shapes, transparency (by changing the black to grey or erasing parts of the black - I haven't tried this, yet) and maybe sizes, but I'm a little doubtful of that.
WARNING: don't forget that you need about 50 pixels around the edges without any content -- each TV is different, but the edges of this PSD will be cut off on the TV!
In short, I think with this that Toast 6 becomes a much more robust DVD authoring environment. No DVD Studio Pro, but darn good for my uses (ReplayTV -> DVDs).
Mac OS X Hints
http://hints.macworld.com/article.php?story=20031215064940671