Testicular (or ovarian) amputation for offenders? (Only one per offence though, and humanely.) It'd have the benefit of reducing the propensity to offend cascading down the generations (whether by nature or nurture or both).
(I'm with those who consider fines for uninsured drivers near to useless: they average less than £200 - probably less than 25% of the cost of insurance. Crushing's not much better when they can pick up a car for £500 or £600 pounds - still well below the cost of one year's insurance.)