When sending thanks, it's nice to to able to underline exactly how grateful you are, so that your message feels heartfelt and honest. The parallel stripes in this design serve to add emphasis to the hexagonal badge in the centre, which of course acts as a frame around the words, so no one can be in any doubt that you really mean it.
About the designer
Matt Avery is a designer and art director who grew up in Essex, and now lives in East London. When not working at MOO you might find him playing music with the band 'Kindness', or trying to get his drum machines to work. He has a hatred of Croc shoes.