Sigma Nu for the last 10 or so years has had a program in place called LEAD. This stands for Leadership, Ethics, Achievment and Development.
The program is designed for students during 4 years of school as to keep Seniors involved. Chapters that have fully implemented LEAD have had some awesome results.
The first year is for the candidate class. Second for sophomores, etc.. It's pretty good stuff.. Mostly applied and hands on.
For example. Part 4 of LEAD Phase I is about Project Planning (I think it's part 4 but who cares, right?) What we do in our chapter is have the Candidate class take charge of the Homecoming or Greek Week activities (depending on what semester). They do not do it by themselves.. However, they coordinate it for the initiates. They are responsible for going to applicable meetings, designing the float, coordinating activities, etc..
It's an excellent program and has really helped a lot of our chapters do complete 180's from being on the virge of dormancy. Here's a link if you're interested:
LEAD Program information