From Wild World Wiki

Furniture is one of the main points of Animal Crossing. Furniture is used for decorating your house or trading in for Bells. In your inventory, furniture is represented by a leaf symbol. There are 562 different items of furniture listed in the catalog, however there are some items that do not appear in the catalog.

[edit] Sources of Furniture

Furniture can be found in many different places. Here is a list of places you can find it:

Personal tools