I am a humble admirer of your theme work.
My suggestion is:
Many of us are educators, code junkies or parrots; not Illustrator or Photoshop graphic proficient.
Can you please create a theme or two that will easily allow customization by simply using gif or jpg files, not PSD? I spent the better part of several days trying to learn Photoshop to customize one of your great 1.5 themes (Bally). No luck, I finally gave up. The learning curve for creating a PSD graphic is just too difficult.
My guess is, many probably also share my frustration.
A friend and admirer.