Okay Julia and Dawn I have to third that vote for the tall cards, I'm hooked on them too!
I also did an envelope for this one. I just masked off the the address area with a post it cut to size. Masked off an area just by placing paper over the envelope and stamped until I got it filled up. I wasn't a good judge of placement so I just came in with Canvas and filled the spots I missed.
So I'm just attaching the photo to share the idea since it is a pretty big envelope to cover.
Here's my card