Call for letterhead and envelope design examples

I need web-ready images of well-designed letterhead and envelopes. They can match each other or not, but the graphic web-ready images should be separate, so that each instance can be discussed in the course I'm developing.

Does anyone have great letterhead or envelope designs that you think could teach new design students?

Thanks for any contributions. I'm interested in examples of design for all industries.

http://www.thelogofactory.com/services.html

click the red button "examples"

looking for original examples, not ready mades, but thanks.

last call...