In keeping with the Korean tradition, we celebrated our son's 100th day of life with a "100 Day Celebration". Known as the "baek-il", we had family and friends over at our house to share in food including the traditional ricecakes. I had to design most everything from scratch since my internet-search didn't turn up many ideas for a Korean 100 day celebration. I had fun with the details...and we had a wonderful turnout and great celebration for Jack.
The full story is found on my blog at http://marie-potter.blogspot.com/2010/08/jacks-100-day-celebration.html