I used the widget sidblog and these are the steps I took:
created a new category,named it asides1
Created a post with only the image in it. (You could make the image a link while you are at it.)
Made the title of the post what I wanted the title of the image to be
Went to the sideblog control and set it to show that category with only one post.
In the widgets control window I put the widget for sideblog where I wanted the image to be.
In the future when I will want to add another image to the sidebar, I will create another category and do the above and then tell sideblog to show both categories
Its a work around, but hey, it works. And I did not have to dig into the code of the template to do it and can substitute other images when I want.