This small little pumpkin is great for kids! I have a single extruder machine, but I switch filaments to do:
1) The first 1.5mm in green or black
2) The next 1mm in GlowFill
3) The rest in orange.
This means the carved out face glows in the dark!
I'm attaching the .STLs of six different faces. In addition, I'm including my template which you can use to carve out your own faces.
I tend to print the first two colors on .20 and move the orange down to 0.10mm.
If you have Simplify3D, take advantage of the multiprocesses to make this even easier!