Need some quick suggestions...

Our TU chapter is working at an event on Saturday called the Outdoor University. It is a hands-on demonstration/lesson type of thing. We will be doing casting demonstrations and instruction and would also like to do some fly tying demos and instruction.

Anyone have any suggestions for a quick and easy tie that I can be tying to get people's attention that might also be easy enough to tie that if someone wants to give it a try they can have a go at it? Preferably something big and flashy that really gets their attention.