An open request to artists of all styles and disciplines.

I am compiling ideas to plan an informal curriculum for the coming summer training season for a small mixed styles training group here in our city.
We typically train outdoors on public parkland and we try to work on concepts and commonalities as opposed to technique swapping per-se.
We focus a lot on h2h/cqc type of work. Lots of stickfighting too.
Among the things I'd like to look at this year is bringing in some training aids/equipment that are home-made or cleverly employed household objects.
Portability would be a factor. Any ideas? Links? Blueprints?
Also, I wonder if anyone has links to online resources for drills or scenario training that struck you as worthwhile.
An emphasis on "outside the box" thinking would be a plus.

Anyone have an idea of their own that they've tried out in group training?
Thanks for any help.