Basically, Wiffle, you need to tell us what you would like for an avatar. Describe to us your vision of what you want staring out from beside your words. Provided its not too far out to left field or too over the top generic, one or more of the fine avatarists what trawl this section looking for something to do will see about drawing it for you, with a variable wait time. Barring complications, etc.
The first post of this thread lays out some basic guidelines to the whole process, but the important thing is to communicate your desire across. Remember to be patient and clarity is a virtue.
SO SAYETH FULLBLADDER THE GREAT AND TERRIBLE
Hope this is even vaguely helpful. Goodnight.