1-bit archive
About
1-bit archive is a library of every possible 8x8 1-bit sprite. (trust me they are all there)
The library is divided into pages of 64 sprites each, you can brows random pages or view them in order.
More importantly, you can use the search tool to find any sprite you can think of. Searching the same sprite will always bring you to the same page where it sits among its neighbours.