Hi Devin, am I allowed to join in? I have a the same thing in mind, I would like square preview images in the 3 column Ajax portfolio view.
In my former attempts with the plug-in above the grey image just got squeezed into a square shape, and the coloured one behind did not change at all :(
Here is a copy of the functions.php. section you mentioned, but there is no ‘gallery’. How do I change the grey preview image & the coloured image without distortion?

//register additional image thumbnail sizes that should be generated when user uploads an image:
global $avia_config;

$avia_config[‘imgSize’][‘widget’] = array(‘width’=>36, ‘height’=>36 ); // small preview pics eg sidebar news
$avia_config[‘imgSize’][‘post-format-image’] = array(‘width’=>630, ‘height’=>999, ‘crop’=>false); // big images for post format image and gallery posts
$avia_config[‘imgSize’][‘fullsize’] = array(‘width’=>930, ‘height’=>930, ‘crop’=>false); // big images for lightbox and portfolio single entries
$avia_config[‘imgSize’][‘featured’] = array(‘width’=>930, ‘height’=>340); // images for fullsize pages and fullsize slider
$avia_config[‘imgSize’][‘portfolio’] = array(‘width’=>465, ‘height’=>346); // images for portfolio entries (2,3,4 column)
$avia_config[‘imgSize’][‘logo’] = array(‘width’=>465, ‘height’=>220); // images for dynamic logo/partner element

//dynamic columns
$avia_config[‘imgSize’][‘dynamic_1’] = array(‘width’=>446, ‘height’=>151); // images for 2/4 (aka 1/2) dynamic portfolio columns when using 3 columns
$avia_config[‘imgSize’][‘dynamic_2’] = array(‘width’=>609, ‘height’=>210); // images for 2/3 dynamic portfolio columns
$avia_config[‘imgSize’][‘dynamic_3’] = array(‘width’=>688, ‘height’=>151); // images for 3/4 dynamic portfolio columns

Thx in advance!