I have been playing around with negative images on Paintshop. I love the effect of it on these photographs - all the warm orangey-brown colours of the Atlas moth have turned into shades of blue/turquoise and the effect is ethereal and night-like - very suitable for the subject of moths! I have used the top image as a background for some moth-based artwork, and I found that using a transfer gel creates a more elusive and a less dominant image.
Page from sketch book using transfer gel and negative image photograph