for us, imbolg welcomes the returning light into our home, and also kicks off spring cleaning. we haven't done a brid's bed yet, but that's mainly beause (due to a number of circumstances) we haven't celebrated lughnasadh for the past 2 or 3 years and haven't had a brid's cross to place in the bed!
for us the focus is on purification and blessing rituals, light, and the triple goddess. we have a 3-tiered wrought-iron candle tree on the altar, with 3 hanging votives on each tier. right now, each of us who are old enough - me, dh, & ds will make a wish for each tier, which represent the maid, mother, and crone aspects of brid & light a candle. when dd is old enough to participate, the kids will each make a wish & dh & i will make one together for the family - i usually do my own thing after the kids are in bed anyway. we then have a houseblessing, carrying candle, incense, water, and broom into each room of the apartment. in the morning, there is a small cauldron of imbolg goodies - spice cookies, milk caramels & butter candies, bath toys, a new nightlight, mittens, etc. - waiting for the kids either on the altar or by their bedside. (dd is too little to care about it much, but she gets a cauldron anyway to emphasise to ds that the holiday is for her, too.)
this year, we've opted to leave the tree up (it's a white artificial "goddess tree") with just the lights on it until the day after imbolg. we also have electric candles and a couple of star-shaped lighted window sculptures to put up in the windows. i know people who use electric candles for yule, but we decided to save them for imbolg, as that is our "candlemas", our "feast of lights". we decorate brooms - although we can't do that this year because idiot dh ACCIDENTALLY THREW OUT MY RITUAL BROOMS WHILE WE WERE MOVING (he'd had 4 days of pure hell & no sleep, but i still ain't gonna let him forget it until he gets me a new one!) and hang a white glittery "snowflake pentacle" on the front door. this year, ds suggested making glittery paper snowflakes to hang from his ceiling. we also made banners from felt, one with snowflakes, one with candles, and one welcoming brid, with her crown of candles. we also continue to decorate pine cones and bare branches & similar crafts, like we do for yule. we do blue & white for colors, although some people use red & white.
for food, cunningham lists spicy foods - we usually do garlic and onions, because they're bulbs - and dairy. last year i think we had a creamy garlic-cheese soup, although we also make cheesy bread puddings sometimes. i make brid's biscuits, which are cheesy baking powder biscuits bruched with melted garlic-herb butter & parmesan - although since we've gone whole grain they've always turned out like rocks. hot posset or milk punch is also traditional.
imbolg is probably my favorite sabbat, appart from samhain, because it's so pretty. but even though traditionalists list it as one of the "greater" sabbats, not too many people seem to know how to celebrate it. i made my son a little activity/coloring book on imbolg, with puzzles & games about brid, spring cleaning, healing, signs of the approaching spring, and a snow maze. for us, the fall and wnter sabbats tend to be the most festive. it's the summer sabbats i have trouble planning - usually because i'm so horribly heat-sick & stressed i don't feel very festive. (i know we're "supposed" to be "worshipping" the sun & all but to be honest i hate heat & i hate summer!) i believe llewellyn has a book out about imbolg, and more can be found out in laurie cabot's Celebrate the Earth.
edited now that dd's been fed & put down for a nap:
DB: thank you for your interest in learning about our sabbat! imbolg, also called oimelc, imbolc, brid's day and candlemas is the modern pagan version of the ancient celtic festival of Brid (pronounced like "breed") or Bridget. it celebrates the very first stirrings of the coming of spring, and the strengthening of the light even in the cold of deepest winter. because of its almost exclusively celtic origins, it seems to be the toughest sabbat for non-celtic pagans to identify with. (Arduinna, you might think of it this way: yule celebrates the sun and god-light. imbolc focuses on goddess-light, and perhaps starlight, because february nights are so clear and cold and perfect for viewing the stars.) when the british isles became christianized, the goddess brid became st. bridget.
DB, i'm not that familiar with the christian candlemas, because i was raised in a fundamentalist protestant household that did not celebrate anything other than christmas and easter. how do christians celebrate candlemas? i'll bet we can learn a lot from each other's celebrations, and i'm curious.