stickers

:: Pre-made stickers
https://www.redbubble.com/shop/stickers
http://www.unixstickers.com/stickers

:: Upload and print a sheet of your own stickers
http://www.stickeryou.com/ (Uses flash player to arrange stickers, checkout is secure)

:: Upload and mass print a single sticker design
https://www.stickermule.com/
http://stickerapp.com/

:: Print your own stickers yourself
https://www.amazon.com/dp/B01DJBMLV2/
https://www.amazon.com/dp/B00007E7D2/
https://sbw.dhl-usa.com/SupplyOrder/SupplyOrderList.asp
https://inkscape.org
https://krita.org
http://www.getpaint.net/
https://www.gimp.org
http://pastebin.com/DzHwTddV (embed)

:: ULTRA PATRICIAN HOOK AND LOOP FASTENING PATCHES
https://www.amazon.com/dp/B00DO7HOI2/ or https://www.amazon.com/dp/B00X3N5OVQ/
https://www.amazon.com/dp/B001IY82FM/
Find your own patches, amazon and ebay are reliable resources.
There are a lot of websites that will custom print patches for you, but doing this can be a long process.