Signature pad as a blob - how to display in a list?

Thank you to ASPRunner for allowing signatures to be stored in a blob within a table. I know it isnt completely efficient, but really useful when sharing tables between sites.

Works perfectly to capture/edit a signaure, but displaying the blob as an image in a list or a view shows an icon rather than the image itself.

i have the field set to 'image' and tried all possible configurations I can think of.
The field int he mysql database is set to blob. (I have tried mediumblob as well).

At the moment my workaround is to have an 'edit' icon taking client to edit screen, but disabled all buttons apart from return to list, but it woud be nice to be able to display the image of the signature in a list view rather than in a popup/another form.

Is there a way to display them in a list?