Most would be considered permanent. I've never removed the ones I have, so I don't know about the paint. They are high quality pieces though.
Edited to ad that these guys do static cling decals that are very non-permanent. I'm using their meatballs and numbers as well as a few others. They are also very good quality.
http://www.cobracountry.com/opsplus/home.html
Hope that helps, Steve