I stumbled upon this project this morning and wanted to share it with you. I am Thankful! is a worldwide gratitude project. It is a project created by artist Damaris Pierce and you can find the website here.
"The project, entitled I Am Thankful, encourages individuals of all ages and organizations such as craft guilds, public schools and counseling centers to create original postcard artwork expressing gratitude. Postcards submitted can honor people, places, things or circumstances and artwork can be simple or elaborate as long as it remains two-dimensional. Once completed, postcards can be mailed to Pierce’s attention at her studio located at 69 Wamboldt Avenue Asheville, North Carolina 28806. All postcards will be considered for public display. In January 2008 Pierce will feature the submitted gratitude postcards on her newly redesigned web site http://www.IAmThankful.com. "
This is a great project to do during the Holidays. You could get all the materials together and have an open station where guest could create their own postcards. You could send them into the project or save them as a memento.