It would be so nice to use Scrapbook Max in the future to create 4-fold invitations.
Another suggestion would be to offer a space for display of any slide shows. Slide shows might be too large for this site, but if there is a solution, it would be a fun way to create.
I use slide shows for lots of things: anniversaries, birthdays, funerals, lectures. It usually takes 20 slides and about 15 minutes in length.