These 7.5 cm (2 ⁶¹/₆₄ in) x 6.5 cm (2 ⁹/₁₆ in) stickers of my "It's Octopuses, not Octopi" are amazing quality and come with a matt finish. These stickers are quite thick and survive a whole range of different environments so you would be able to stick them on almost any surface. 

Octopus Stickers

AU$8.00Price