Standard clipart is usually not a very detailed drawing. Mostly they are images that have little detail or are outline drawings. The standard clipart is for use on the web to use in documents.
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.
You probably know you have standard stock clipart with your Microsoft package. You click on INSERT --> PICTURE and then type in what subject type of picture category you want....and you get a few samples that pop up. But there's really not very many to choose from. Kind of boring.