For my son's preschool class, we printed personalized, glowing Valentines for each child. My son and a vast majority of his classmates have unique names that you aren't going to readily find in mass produced items. I printed the first 1mm in Red and then switched the filament and printed the details (including the personalized name) in GlowFill.
Thanks to Riham's STL to OpenSCAD tool (http://www.thingiverse.com/thing:62666), I was able to make this into a Customizer project even though the heart and the hook itself were originally modeled in Blender.
If you just want a normal heart, turn off the Make Pendant option.
Details on my modeling and printing process can be found at http://tgaw.com/wp/?p=333
The red layers I printed in 0.25 high layers. When I switched filaments to GlowFill, I also switched down to 0.10mm high layers.
0 - 1mm: ColorFabb Traffic Red PLA/PHA
1.1mm and above: ColorFabb GlowFill
Both the heart and the hook I originally modeled in Blender. I used Riham's STL to OpenSCAD tool (http://www.thingiverse.com/thing:62666) to convert that to OpenSCAD code.
By changing OpenSCAD variables I was able to quickly make models for all 17 children.