brahmnan

If you want user avatars to be displayed quickly and do not use external services, the module for generating “identicon” avatars using “canvas” is suitable for you. 
“Canvas” avatars will be generated for all users who do not have their own avatar images.

Identic canvas

This plugin creates user "identicon" avatars in "canvas" format using user email

Daniel

Provides a “Marker board” widget for visitors to play with. When a user’s mouse moves over the widget marker will be drawn on the surface.
The widget has four options, line color, line width, box width, and box height. Unfortunately html canvas requires explicit dimensions, the default dimensions for Markerboard are 150px by 150px.

WP Makerboard

Provides a "Marker board" widget for visitors to play with.

Identic canvas vs WP Makerboard