It seems that I have not explained myself very well...
I am simply trying to add an image to the page attributes area of the admin area depending on what template is selected, here is a simple mockup of what I wish to achieve: Dropbox Image Link.
I am looking to add the ability for my clients to see an outline or wireframe (an image) of the currently selected template while editing a page within the Wordpress admin area.
A massive bonus would be for the clients to be able to actually select the template by viewing and subsequently clicking on images of available template/content layouts.
However I could be over-complicating the situation of course. Because I am using Wordpress more as a content management system with some fairly unique and/or complex content layouts (such as grid heavy layouts with multiple columns and content areas) I simply want to give the user as much indication of what field is for what without writing long/complex names for each content block, column or grid position.
If it matters, I am using the add-on's Advanced custom fields (with all purchasable extras such as repeater field) and Multiple content blocks.
The areas defined within the template are not necessarily always for the same content so simply naming each field/block "area for meet the team profile", "put intro paragraph here" soon becomes irrelevant and more confusing.
I hope that I have provided enough information.