We also had fun producing a special place for them to store their cards, I have hung these and the points information in the kitchen on their art wire.
It is by no means a magic button, but it has made me and MadDad more aware that we need to praise the good, in addition to punishing the bad.
We also operate a final warning system of Yellow and Red cards, which appeal to the MaxiMad as he has just started Football Tots. If they do something that we don't approve of they get a yellow card or final warning and then if they repeat it then it is timeout (4 mins). There is also a list of things that are immediate timeouts ie hitting and spitting.
We both make an effort to explain the consequences of their actions, so that they are aware that things happen because of them too.
However, one thing we are really struggling on is bedtime, both boys went to bed and sleep no bother until I was hospitalised, now every evening is a nightmare. We do our routine of bath, PJ's story and snuggle, but they keep getting up and being deliberately naughty - HELP