Three issues obviously, first, the cursing and behaviour. Second, door knocking, sounds like they were just having a laugh (to your neighbor's evident displeasure). Third, lying to you guys about it.
It's easier to say stuff, then enact. I get mad at wifey when she says no games and stuff for a week, because that hurts us also, if for example we want to play games or have them out of our hair for a bit.
So we find it difficult to enforce such.
But, with the first of "teasing" (?) the girl, showbag seems to fit that. Then your neighbour, since she's concerned about her car, maybe if she's willing, your boys can wash it several times for them. Seems a natural punishment.
As for lying, in addition to a good talking to why they lied and talking through until it sinks in such is wrong, not to mention the practicalities of you can't help them if they lie to you. A year seems like it'd be hard to enforce, and what if you catch them again? What then? Christmas presents also seems extreme, too far removed from the crime.
I'm just adding my input since it was asked, but your husband should make the final decision. If you have some concerns over the degree of punishment, talk it through with your him. At the end of the day you both will be responsible for enforcing the punishment so it needs to be fair also on both of you.
Finally, something I heard not long ago surrounded the following passage:
- "Whoever spares the rod hates their children, but the one who loves their children is careful to discipline them." (Proverbs 13:24)
Discipline is primarily about guiding, not necessarily punishing. The rod here, is the one a shepherd uses to guide and protect his flock. Severe punishment might only harden your boys further, and not make them realise their wrong. Long-lasting punishment I find doesn't work on my eldest. He kind of just resigns himself to being bad, because what's the point, he's already been severely punished? Kind of digs in and hardens. Each of my children works and responds differently though.
I'm often more concerned about getting them to see how deplorable their actions were, rather than simply thinking of a good punishment. Easier said, than accomplished, but you sound like good parents -- I'm sure you'll work out something.