You can buy a vinyl plotter called a Craft Robo, design your own stencils on the computer in a vector style program like Illustrator or Corel Draw or Inskscape (completely Free !), then put some paint mask through the cutter and it will cut them for you so you have perfect symmetry and clever things like that.
However it's not always easy to place these perfectly each and every time so often easier to use liquid mask ( RCS is the ebst stuff ) and print your design out on normal paper, cut it out and then draw around it on the outside of the shell, then cut it out by hand on the inside.
I'm not entire sure that's what you meant but hopefully is of some help.
Alternatively you can get people to print stuff for you that you can put inside the shell and back with your own white or colour, or even cut masks for you, just go to your local sign shop.
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