Doodling on an Envelope

Just Scribbleprinting on a random envelope.  This one isn't for sale (I would love to do something like this on envelopes, but the blue on blue makes this a difficult design to copy...plus I smudged it.  Thought I'd try to "match the smudges" and do one on the other side but don't think that helped).

Apart from the smudges, what do you think?