In the webassist/plugins/catalog/popularbox.php an featured box.php files, there is acode similar to:
<?php
$imgWidth = 207;
$imgSrc = (($row_MostPopularRS)?'../../../'.$WAGLOBAL_Images_Folder. $row_MostPopularRS['ProductThumb']:'images/default-product_thumb.png');
$imgSrc = abs2rel(rel2abs($imgSrc,dirname(__FILE__)),dirname($_SERVER['PHP_SELF']));
$WAResultsImage = new WA_Include('scripts/resize_image.php');
require($WAResultsImage->BaseName);
$WAResultsImage->Initialize(true);
?>
the $imgWidth setting sets the size of the resized image that will be created.
the is similar code in the webassist/plugins/shopping_cart/cart_editable.php file:
<?php
$imgWidth = 126;
$imgHeight = 126;
$imgSrc = "../../../" . $WAGLOBAL_Images_Folder . $WA_Store_Cart->DisplayInfo("Thumb");
$imgSrc = abs2rel(rel2abs($imgSrc,dirname(__FILE__)),dirname($_SERVER['PHP_SELF']));
$WAResultsImage = new WA_Include('../catalog/scripts/resize_image.php');
require($WAResultsImage->BaseName);
$WAResultsImage->Initialize(true);
?>
the $imgWidth and $imgHeight settings set the size of the image, you can edit these to a size you prefer.