A downloadable artpack for Windows, Mac OS X, Linux, and Android
A set of 950 procedural 1-bit sprites depicting all sorts of wonderful lifeforms, alien machinery, and gliphy goodness galore.
All images are PNGs. The download package includes a full spritesheet and a folder containing a separate file per sprite.
This artpack is released as CC0 (public domain), so feel free to use and abuse to your heart's content!