I had to sit back and laugh at this one...... After three hours of slowly turning every psd file in the UI folder blue, I ended up with this. For all intents and purposes this should all be blue but parts "disappear" rather than change colour..... I've tried it with black too, oddly enough they disappear as well. Seems that if it is not a certain shade of grey things "vanish" rather than change colours.

Only your mind limits yourImagination. Let it free.