Gemstones that match the month in which someone was born make the jewelry all the more special as long as that person likes their birthstone. See the Gemstones article for more information about birthstones.
Flowers are one of the easiest ways to express how you care. For birthdays, get flowers for the month in which the recipient was born to make the gift more meaningful. Or if you can't get ahold of fresh cut flowers, consider dried and pressed flowers. Another option, especially if you are buying for the person with a green thumb, is to buy a gardening tool set and include the seeds. Find out about flower meanings at the following Web sites: About.com, Sweet Love Gifts, and Pioneer Thinking.