Here is a gorgeous wedding reception from Martha Stewart, that makes a very elegant statement with very natural materials. There are lots of ideas here that could be incorporated into any type of gathering.
A seperate kids table is covered with paper and pencils are provided so the kids can draw right on the table and be entertained.
I love this idea of personalizing a quilt for the happy couple! Supply squares of fabric that the guests can write well-wishes on, and then have it sewn together for a keepsake quilt. This would be perfect for a baby shower as well!