I’m not sure you can really call these puzzles, but I like the idea behind them. Each Pixel Puzzle seems to consist of a set of square stickers in various colours. You are supposed to stick the stickers together to form the image on the box. Although singe the stickers don’t seem to interlock I assume you could make any image you wanted to with the included stickers.
There are currently 7 of these to chose from: 3 hedge hogs, a cactus, a shark, a reindeer, a penguin, a squirrel and a crocodile:
You can find them all on Luisa, Catarina Lente‘s Etsy Page.