Email Backgrounds works exactly as described. If you want a simple, and effective way to add nice backgrounds to e-mail messages that you compose using the iPod touch or iPhone, I recommend it unqualifiedly. You may want to know, however, that the backgrounds need to be downloaded to your devise each time you write an e-mail, and you therefore need to be online for the app to work. This may be more of an issue when you intend to access the internet via WiFi only, as you cannot write an e-mail message off-line with the background intact, thinking that you can then send it later upon entering a WiFi zone.
Now if someone could write an application like this to use with Apples e-mail program for use with our computers...
Joe Calm, PhD about Email Backgrounds