A great gift for someone with a new baby, new home, bar/ bat mitzvah or for a wedding/ engagement is a mezuzah. A mezuzah is something you will generally see on the door frame of a Jewish home. They are usually thin and rectangular in shape, though they do not have to be. Some are simple, others colorful and ornate. The important thing is really the scroll that's inside the mezuzah case.

Here's some background information from my friends at wikipedia.com:

refers to one of the 613 commandments in Judaism, which requires that a small parchment (klaf) inscribed with two sections from the Torah's Book of Deuteronomy (6:4-9 and 11:13-21) be affixed to each doorpost and gate in a Jewish home and business. Deuteronomy 6:4-9 and 11:13-21 are two of four passages used in Teffilin.

Thus the word mezuzah can refer to any of the following:

Simply a doorpost of a permanent door, gate, or arch.
The special parchment with the required Hebrew inscriptions.
The small case or box that typically covers the parchment. (The parchment can be affixed directly to the door, though usually a case is used in order to protect it. It is important to be aware, though, that a case without a valid mezuzah scroll inside cannot be used to fulfill this mitzvah.) The case generally features the Hebrew letter shin inscribed on its upper exterior. Artistic mezuzah cases are often given as gifts for weddings and other special occasions.

We have the tradition of putting a mezuzah on the doorway to any space we are living in. Though many will say that the commandment can be fulfilled by putting one mezuzah on the main entrance door, most people put a mezuzah on the doorpost of doorways to all rooms in their homes, except for the bathroom and closets. A mezuzah is a great way to personalize one's space - children can help put up a mezuzah, and can choose or make their own mezuzah case. Make sure a mezuzah for a child's room is placed within his/ her reach. Many people have the tradition of touching the mezuzah and kissing one's fingertips upon entering or leaving a room - it's a nice way of reminding ourselves of doing mitzvot (commandments) and on a spiritual level, thinking about the more imporatant parts of life that often lie hidden beneath the surface.

This and other photos, as well as more information can be found at religionfacts.com