Sometimes I make a drawing and put it in the comment-field instead of words. I just made a birthday-greating for example, but while I did so I thought I might find some of the images thrown randomly in my many image folders. I have taken a daily hour lately to get some order in all the harddisk mess, and in doing so I have created a comment-art folder, so I have somewhere to put them when I find them.
It is not always I remember the context so some of them are pretty cryptic. But I mostly remember which user it was for.
There are also some comment-art in this post with Katharsisdrill portraits.