I have found a site which may be of interest here.
Go to it to see what you can do.
Below is a very simple example of what you can achieve.
I only found it an hour ago, and have been playing.
I am going to play more, and try something much more elaborate. I will post the results and explain the technique I am using.
The program is free do use as you like (in fact the guy states in FAQ that he has no interest in selling the program, its just a hobby for him.)
You will see that there are steps to go from your design within the program to a cutting file, but I think it is fairly straightforward (I have to do more experiments).
If others are interested, it would be nice when they created patterns, to post them here for others to use.
More later.
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.........................Mike