I used this with raffle cards for good/improved work etc, but can be used with table points etc.
Children get to pick one at the end of the week. Children are picked at random (so that it isn't just higher attaining children that get the 'good work' rewards) and can either pick a random card or can choose which reward they would like.
'Treasure box' lets children pick a small gift (from the pound shop or similar) from a box that they can take home and keep.
'Stuffed buddy' lets children bring in a small toy to keep in their trays or on their tables (depending on the children on their table). Children need to be told, however, that these toys are their responsibility and need to be looked after and not lost etc.