kate's envelope on top has the white lettering on black paper, which is then adhered to the green envelope. that's a really good idea. i like the way the bold stripes pick up the subtle stripes in the watermelon. she also took some ideas from the stamp for fitting the wilson-letters together.
carol also took shapes and colors from the stamp. the p.o. gave her a double cancel which -in this-case - is actually a fun addition to the overall design.