Bare Essentials is a book by Dennis de Groot featuring images which reduce popular video game, comic book, and other characters to their most basic representation, using simple geometric shapes. Just like those pixel characters by Ty Lettau, they reduce characters to their most basic essentials.
There are 50 different characters in Bare Essentials, and almost all of them are easily recognizable. The book was released recently, and it’s available from Lebowski Achievers for €25 (~$34 USD). There are even some prints of the Teenage Mutant Ninja Turtle (Donatello) that made the cover. They sell for €50 (~$68 USD) and are each signed and numbered.
deGroot is a Dutch designer who created the illustrations, and the project was brought to print with the help of Nalden.