Non-Member

Non-Members are penguins that do not pay a subscribed Membership, or former members who had a membership that expired on Club Penguin.

What Non-Members Can Do

Buy colors, flags, and backgrounds from catalogs, and most recently are able to buy items from a page in the Penguin Style catalog (introduced in January 2013).
Collect a free item given away at parties, and be able to become EPF Agents, Ninja, and tour guides.
Wear pins, found hidden on the Island.
Buy up to two Puffles (two Blue Puffles, two Red Puffles, or one of each color).
Buy puffle food.
Waddle around anywhere in Club Penguin, excluding "member-only" rooms (certain Party rooms and the Cloud Forest).
- Only former members with the Moss Key Pin can explore the Underwater Room even after their memberships have expired.
Chat with other penguins.
Play certain levels in most mini-games.
Earn stamps, excluding member stamps.
Meet Famous Penguins and obtain Autographed Backgrounds.
Unlock items or puffles from the Treasure Book.
Decorate their igloos with certain furniture items.
Do Puffle Tricks.

An item which can only be obtained by members.

Buy furniture.
Buy any color Puffle apart from the Red Puffle or the Blue Puffle. However, they can get any color of Puffle if they have a toy code except for the Rainbow Puffle, Gold Puffle, Blue Border Collie and Orange Tabby Cat.
Open their igloos to guests.
Obtain stamps that require membership.
Customize their Stamp Book cover.
Buy most clothes or objects.
Obtain member-only pins such as the Moss Key Pin.
Buy or obtain member backgrounds like the Top Of The Mountain Background.
Play certain levels of games like Catchin' Waves and Jet Pack Adventure.
Enter member-only rooms.
Join servers that are full (except for a former glitch).

There are several catalogs with items that non-members can buy as well.
Non-members can unlock the Pineapple Igloo with Innocent Smoothie codes.
Penguins can still keep their puffles, member-only stamps and pins when their membership have expired. However, they cannot have access to the members-only clothing, igloo and member-only furniture, their decorated stamp book cover, etc.
When a membership expires and the penguin is wearing member clothing, it stays on.
Prior to February 2010, flags could only be purchased by members.
As of January 2013, non-members can buy clothing in Penguin Style, though, the items available have never been replaced by new ones.
The non-member star badge on the player card is recently removed.