Replacing the image bar with something else.

This is a question different from the one I asked earlier about removing the entire image section. (I still need to do that for a certain site).

But I have another site where I want to replace the image with something I've found that is really clever, and is well suited to a travel journal web site of mine (www.sprangleblog.com).

If you go there now you will see I have activated a WP theme called "Sliding Doors." Roll a cursor over the images. They are clickable, mapped to Categories so that clicking on one will take you to that linked Category.

I intend to replace the theme's default images with my own photos that reflect the SprangleBlog site content. But, selfish me, I want the Atahualpa Theme, not the Sliding Doors theme (I really don't like reverse text). I want the clean, bright 3-columns of Atahualpa - and it's fantastic theme control panel.

So, my question is, how to replace Atahualpa's image bar with that of Sliding Doors?