What better envelope to celebrate with than this excellent one from Cathy O.
The stamp shows the corona of the sun, only visible when the surface of the sun is blocked by the moon. USPS has really issued two stamps in one, as, when warmed, the thermochromic printing process reveals the ghostly surface of the moon.
The rest of the fun July envelopes came from...
Jean - this one didn't scan well, it is bright pink in reality - and Troy - some stylish calligraphy.
Debbie made an envelope from a beautiful illustrated book page.
Amy put together this fascinating collage on her envelope.
And Tina used some sort of reveal-the-color technique. I am not 100% sure how she did it, as the black layer looks like it is stuck to the rainbow layer. Regardless, a great effect.