We are working on a designer for the next release, it should be available by next week.
If you don’t want to wait you can fully customize the gift card email to suit your needs. We use the built in WooCommerce email template system. To override the email you should copy this file:
/wp-content/plugins/pw-woocommerce-gift-cards/templates/woocommerce/emails/customer-pw-gift-card.php
To here (you may need to create the subfolders if they do not exist in your theme folder):
/wp-content/themes/<your-active-theme>/woocommerce/emails/customer-pw-gift-card.php
Once the file is in your theme folder, open it up in a text editor and make any changes. You can change colors, wording, etc.
You can find out more about customization here: https://docs.woocommerce.com/document/configuring-woocommerce-settings/#section-21
