I've used blue tape, shelf liner, packing tape, and they all work, but, in my view the added work when cutting fretwork is not worth it to me.
Added work - picking out all the small pieces of tape left behind after cutting
I sand the piece with 220, blow it off, spray the pattern, stick it to the wood. When finished I use a sponge brush dipped in mineral spirits on the pattern, wait 30 sec and the whole thing lifts off. Dip a paper towel in the MS, wipe down the surface and let dry