Just newspaper and boxes but we have to take them to a center so we let them build up for months usually before we get around to it.  We're good with the newspapers -we put them in brown paper bags to keep them neat but the boxes take over quickly!  Dh keeps a lot of them in the basement for ebay but the ones that need to be recycled end up multiplying in the garage until we get fed up.  I want to install a bin on one wall to put them in in between trips.