Robert went with the always-works layout of something growing in the lower left. The touch of red relates nicely to the stamp.
Kristine's foliage is more abstract - which is very appropriate with the other elements on her envelope.
Way down at the bottom, I posted the note from Rachael. I usually don't post personal notes - but this one cracks me up. Perfectly worded comment on a detail that displeases the artist. I plan to steal the sentence and apply it liberally to comments on my own envelopes.