Baskets / Eggs - These items refer to individually numbered containers received by collecting a specific amount of eggs and then (sometimes) 'talking' to the Easter Bunny upon completion. These containers date back to 2003 and 2006.
[CORP]oration items - These are stylized apparel and accessories that relate to a character group. For example E CORP, which is known for robotic rabbit characters. These items are obtained by siding with a group for the sake of battling an opposing group. These types of items began in 2011.
Shop items - Stocked in shops, these are items released for the sake of the season or for the theme of the event. Unlike event items they cost gold, stickers, or cash.