If you live somewhere where there is no chance of getting a Tolbunt Polish, the only possible way you're gonna get some is by making from scratch, and the only way to do that is by using crested birds who are mottled. No solid whites, but mottled. (black with white tips) It's a long road though. With luck and huge batches you could get Tolbunt on your second generation.
Indeed silver laced mottled (silver Tolbunt) isn't all that interesting, but so far my family finds my sex-link (golden) cockerel quite attractive. He's just a tad yellow in the crest and on the wings and saddle, but otherwise looks much like a mottled silver laced. It's basically like a messy, broken silver laced.