MyWhiteboard adds a whiteboard when writing messages that allows users to draw an image and insert it in the message.
The whiteboard is shown when creating a new thread, writing a new reply, writing a new private message and during the quick reply to threads and private messages.

The maximum size of the whiteboard can be set in the settings of the plugin in the AdminCP. The image is created with a transparent background and before being saved it is resized by removing the white spaces on the sides.