Hi genzer,
My Observations:

The variables "commerce_order_background_border_...

Hi genzer,

My Observations:

1. The variables "commerce_order_background_border_color" and "commerce_order_background_colors" are configuration variables and should be removed/deleted on module un-installation. Check hook_unistall().
2. Incorrect spelling of background at line number 5 of commerce_order_background.module.
3. :) in drupal_set_message line number 91 of commerce_order_background.module.I suggest you remove it.
4. It would be good if you could provide more flexibility with the views this module works with.Currently it only works with Commerce Backoffice Orders.

Best Regards