Abstract: Data defining an avatar is received over a network. A sprite sheet comprising a plurality of sprites is created, using the data defining the avatar. Each sprite includes a partial rendering of the respective avatar and at least one run-time parameter including a sprite attribute. A plurality of requests are received, over the network, for the avatar from a plurality of user applications. The data defining the avatar and the sprite sheet are transmitted, over the network, to each of the requesting user applications, enabling each respective user application to display the sprites in the sprite sheet and to set the run-time parameter associated with each of the sprites in the sprite sheet such that each respective sprite is thereby customized to the application.