From: Recommended by a Friend
Like: The wide variety of skin designs & the coverage provided (area around keyboard)
Dislike: Does not provide coverage for bottom of computer or trackpad

Suggestions:
Provide coverage for bottom of computer and trackpad. These don't have to include designs - they could just be transparent sheets. For some designs, I didn't like the area of the picture that was used for the skin around the keyboard/trackpad - perhaps you could allow customers to choose which part of the design is used for this area.