Halloween Avatars

Name: Halloween Avatars
Homepage: Vector Graphics
License: Creative Commons Attribution 3.0
File Type: PNG/GIF/ICO
PNG file stored in the Portable Network Graphic (PNG) format; contains a bitmap of indexed colors and uses lossless compression, similar to a .GIF file but without copyright limitations; commonly used to store graphics for Web images.
ICO format used for storing icons for Windows programs, files, and folders; contains two bitmaps: 1) the AND bitmap – the image mask (which determines what part of the icon is transparent) and 2) the XOR bitmap – contains the icon which is mapped onto the image mask; ICO files can be modified to create custom icons.