How much is it to get a pattern shaved into part of my hair?

It depends on the place you go to have it done, price wise you would be looking at around 10-15 pounds, i would suggest finding a very well astablished barbers and go in an ask, for a pattern to look good you would need to have it fairly short from a grade 0.5-1.5 for it to be really sharp an to stand out, hope this helps
from the Barber at solo salon