i was just asking the same question last week!!!
i have been using a star chart and it really works!! my daughter is 3 and starts nursery in sept so she also is bored... i have found out that al i was doing was tellin her off... so i thought of doing a chart as a way to praise her!!! she gets a treat at end of week if she has lots of stars!!
also she can get up2 10stars a day!! so all good things r being praised... and not too big a gap as younger children can not think too far ahead!!