In order to change the border color of the text box, where you can enter your customer notes before confirming the order you should edit thecomponents/com_virtuemart/themes/default/templates/checkout/get_final_confirmation.tpl.php file.
Include the following attribute in the textarea line:
style="border-color:COLOR"
Replace the COLOR string with your preferred color (you can use a name or a HEX number).
The modified line will look as follows:
<textarea style="border-color:blue" title="<?php echo $VM_LANG->_('PHPSHOP_CHECKOUT_CUSTOMER_NOTE') ?>" cols="50" rows="5" name="customer_note"></textarea>
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