Paul

You may choose a colourful style for the custom coupon message, or wrap the message in your own CSS class container.
It’s also possible to hide the default message from Woocommerce so that only your custom coupon message is displayed. 
(the plugin uses inline CSS to hide the default Woocommerce message).
Take a look at the screenshots for the coupon edit screen with the plugin enabled and some examples.
The meta box was implemented using the technique described on this blog post: 
http://wp.smashingmagazine.com/2011/10/04/create-custom-post-meta-boxes-wordpress/
The message styles were generated using this tool: 
http://www.bestcssbuttongenerator.com/

Woocommerce Custom Coupon Message

This plugin adds a meta box to the coupon edit screen where you can make your own customized coupon message.

Jeroen Sormani

WooCommerce Coupon Generator is a coupon generator that allows you to setup and generator tens of thousands of coupons at the same time.
By going through 3 easy steps you can setup your desired coupons and start generating the coupons.
Generation process 
Step 0) Introduction, ‘how to’ 
Step 1) Select coupon settings 
Step 2) Select generation settings 
Step 3) Coupons are being generated
The coupons are generated in a very effective way so they will even work on low-cost hosting. During the generation process you will get updates about the progress.
Tested up to 1,000,000 (!!) coupons.
Please leave a rating if you found this plugin useful
If you have a feature request, let me know, they’re always welcome!

Coupon Generator for WooCommerce

As others have noted, it might be nice if this plugin exposed a couple of additional features for bulk modification - like custom code prefixes or suffixes, or descriptions, for example - but it does just what it says, exposes at least some of those features via filter for custom development, and is bottom-line great "for the price."

Works great fresh out of the box

Great plugin, does exactly what it states and does it in a very friendly user interface. If I could add something more to it then I guess it would be an option to delete all of the generated coupons in case of an error.
Thank you for the excellent product!

Does exactly what the name suggests

Generate WooCommerce coupons easily and fast.

Woocommerce Custom Coupon Message vs Coupon Generator for WooCommerce