The cross has long been a symbol of Brighid, the Irish goddess who presides over hearth and home. In some legends, the girl who became St. Bridget wove the first of these crosses as she explained Christianity to her father, a Pictish chieftain. In other stories, the cross is not a cross at all, but a wheel of fire, which explains why it's a bit off-center in appearance. In parts of Ireland, Brighid is known as a goddess of the crossroads, and this symbol represents the place where two worlds meet, and the year is at a crossroads between light and dark.
A Brighid's Cross can be purchased in many Irish craft shopes or at festivals, but it's actually pretty easy to make your own. You can incorporate the creation of your Brighid's Cross into your Imbolc rituals, use it as a meditative exercise, or just put one together with your kids as a fun craft activity.
To make your Brighid's Cross, you'll need straw, reeds, or construction paper -- if you're using plant material like straw or reeds, you'll want to soak it overnight so it's pliable when you go to make your Cross. Your end result will be about the length of one piece of your material -- in other words, a bundle of 12" reeds will yield a Brighid's Cross just slightly longer than 12".
** Note: for a super-easy, kid-friendly edition of this project, use pipe cleaners.