Redesign 3D boxes and cover artwork for 17 courses

I run a distance learning company that offers courses in a variety of subjects.

I need someone to redesign our existing cover artwork for 17 courses. This artwork includes:

- Website 3D boxes (see http://www.inst.org/photography-courses/images/become_software.jpg for an example)

- Course print covers and spines (see attached for an example)

- Course letterhead (see attached for an example)

You would deliver the files in jpg, gif, png, psd formats.

Please provide me with examples of your work and details of your experience.