Time for carving fun! I tried a new technique with my pumpkin this year that allowed me to use essentially three values. The mid-tone is achieved by carving away only the top layer of the rind. This allows some light to pass through the flesh of the pumpkin. It is a bit like working on scratchboard, in that you start with the dark background and carve away to get lighter areas. I found I couldn't use just any kitchen knife for this, so I actually got out my miniature wood carving gouges! They were just the right size and worked perfectly.