Beside the snowballs whit itens i can send? i dont find a guide in the foruns to help.

any items from Get Mugged, Icy Goods, and The Bake Stop

If you don't want to restock you can vend the items from Frosty Claw or Celebration Gift vending machines. The items from each shop will only appear on the donation page so it makes sorting far easier.

any item from this shops work?

yup, any item in them.