The craft stamp industry is very large indeed and most people are still buying stamps that are mass produced because they don't know how to get a 'custom made' stamp manufactured. So if you are into card making or scrapbooking and want to find that 'special stamp' you should find yourself a manufacturer, it doesn't matter where they are in the world as unmounted stamps are thin and lightweight and can be posted easily.
Publishing programs such as Microsoft Publisher. Many publishing programs contain a data base of artwork that can be used in any document
You can also cut out a picture from your Royalty free Christmas clipart graphic images package and glue them to the paper chain, one picture a day.