I went back to Carved , as I was really happy with my last wood accented case.
This time, I noticed that there was an option to add a custom graphic to the wood on the back of the case.
I wanted to have a resistor icon on the case, but couldn't find one that I liked through image searches.
The Carved site would allow the upload of a custom graphic, but it needed to be a SVG file.
I wound up using Processing to design my own resistor icon, and then export it as an SVG.
Here's a link to the Github repository with the Processing code, and output SVG image.