Envelopes have been pictured on the 2008 Europa stamps (in the year two-thousand-Eight :-) )
For example on this Dutch Europa stamp:

And on the Russian Europa 2008 stamp a modern and classic version of an envelope:

Envelopes behind a modern communication medium (facilitating E-mail!) on the Europa stamp from Azerbeidjan:

Erwtjes, I think a funny Dutch word. It means 'tiny peas' (erwten is the normal plural form of the singular 'erwt'), and I was happily surprised when I saw erwtjes being honoured with a stamp from France:

The erwtjes came on a chaincard themed 'green'. And when thinking of 'green' I think of the Environment, and the need to protect it. So I also was happy to see this stamp on the card. Issued by Turkish Post, a beautiful symbolic way to show the importance of protecting the environment, to embrace the Earth.

See what other 'E' other stamp lovers had in mind on this Sunday at Violet's See it on a Postcard and follow the links in the comments.