envelopes, boxes and poly mailers for shirt and stickers.
polymailers code 4, not curbside recycle, only if taken to recycling that accepts bags
paper boxes with plastic tape take and extra step to recycle
paper boxes and paper tape is totally curbside recyclable.
envelopes that disassemble and turn into fridge magnets or origami animals
either buy them preprinted, scored and then folded and glued or print / score / glue and fold myself.
zazzle offers custom USPS stamps with your own artwork for 2x the price of normal postage
t-shirt boxes could also be used for big stickers, prints, etc.
refridge magnets USPS prohibited – Magnetized material with a magnetic field strength of .002 gauss or more at a distance of 7 feet.