I did the hamper thing too last year for dS who was 4, it contained:
A carton of ribena (as he detests drinking hot things)
Some chocolate penguins
Handy manny xmas dvd
Some special bubble bath (in the shape of a xmas tree)
Iced mince pies (for me and DH)
Reindeer food
2 x sachets of hot chocolate and 2 x xmas mugs (from poundland for me and DH)
I managed to open the front door while he and DH were watching TV, put the hamper on the doorstep, ring the doorbell, close the door and run back into the kitchen, saying "DS, could you get the door?", he nearly wet himself with excitement. I also made up a poem, and when we read it to him, he nearly cried he was so excited! I bloody love xmas, me!
Also bought a plate for 50p from a charity shop with lots of santas and reindeers on it, so that was used for the carrots, milk and mince pie for santa and the reindeers, i cant wait, hoping its as magical this year as we will also have a 4 month old DS2!