1) Click the palm tree which forms the P of Plants on the first page to get it.

2) Click the Refrigerator to get the Cake

3) Click the LCD TV to get the Big Screen TV

I will also include the Igloo catalog secrets here:

1) Click on the bar that is sticking out above the floor removal service page to get the Secret Stone Igloo

2) Click the door of the Deluxe Snow Igloo to get the Secret Deluxe Stone Igloo.

Those were the secrets. Have a nice day in Club Penguin!