My gut instinct is to caution you against using intermittent extrinsic motivators heavily. Some self determination theory researchers-- such as Deci-- find prior reliance on extrinsic motivators causes a marked decline in intrinsic motivation when the same task is later performed without external rewards.
Personally, I would try to be seen modeling intrinsic motivation wherever possible. This could involve openly voicing the importance of a behavior as you do it to reinforce the unspoken message. That way, through introjection, the underlying character attribute behind the behavior is internalized as a part of the child's--or adult's!-- identity.
