Desktop Drawing Apps and Alternatives

Some apps can be used to customize the appearance of one's desktop by drawing all over it.

Although these tools are usually simple ones, they will still allow their users to change the color of the brush or its size.

One may also use such tools for demonstrations, education, explanations, or just amusement.

Needless to say, all drawings may also be easily erased and they will be removed once the app is closed.