This is the corporate ID package I made for a local vet office. The style of the package is based on origami figures of a cat and a horse, as portrayed in the logo.

This is the front of the letterhead.

Here is the back of the letterhead; compete with fold lines and instructions for how to fold the letterhead into a horse origami. 

This is the front of the envelope unfolded.

This is the back/inside of the envelope unfolded.

This is the front/outside of the business card, unfolded.

This is the interior of the business card upon unfolding it.