An easy way is to use some Play-Doh .
it's cheap and has low adhesion .
Roll it into snakes and lay it out to create the pattern you want .
You can stick additional tape or paper down to protect from overspray on surrounding areas as needed .
They make masking putties for this but they are far more expensive and have greater adhesion which can be an issue ,
I did this with Play-Doh :
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Sorry for the crappy photo , it was the only one of the Play-Doh application .
The height of the putty also makes it easier to control the thickness of the paint at the edges since you can use it as a shield .