[Callers] Easy flourishes or other "bonus" movements?

I would like to teach some of my more advanced dancers some flourishes or other embellishments to contra dance. I'd like to start with things that are easy and obviously that can be smoothly integrated into a dance. Simpler is better and I am especially looking for "extras" that can be done singly rather than within a couple. For example, simply twirling during a do-si-do, or little "meanwhile" things you can do while waiting out as your partner allemandes with their diagonal. I've found some YouTube videos, but they tend to be for more elaborate technique than I am interested in introducing at this time. Thanks for any thoughts, tips, support, or warnings! :) Lenore Frigo