Marge, you might borrow some of Ginger's ideas for her Winter Wonderland theme brunch...it sounds so pretty and festive. I think it would lend itself well to an open house. Do you have any of the Gooseberry Patch books? They have great recipes for almost any type party you care to host. Here's some thoughts:
*cranberry spread and crackers and/or gingersnaps
*BLT dip with crackers, chips and/or French or sourdough bread cubes
*cheese dip and tortilla chips
*Parkerhouse rolls with slices of deli ham or turkey (very thin) with small bowls of mayo and mustard
*mini quiches (make them in a small muffin tin and use the small paper liners-very festive and portable)
*small cups (demitasse cups or just small tea cups or even disposables) of a creamy, warm soup-potato, broccoli cheddar or tomato bisque)
*a punchbowl with a pretty punch and an ice ring-make it using the punch and some fruit and it won't dilute your punc
*a crockpot with warm apple cider or Christmas tea
If you wanted to do a small favor, you might think about simple glass balls in your theme colors and use a paint pen to write "Merry Christmas 07" or whatever you want. You can pick those up at Wal-Mart for about $2.00 per box, with 10-14 per box, depending on the size of the ornaments. You could tie a thin satin ribbon on the hanger to dress it up a little, if you want it a bit dressier.
The paper products they make these days are so pretty, you could match just about any decor and theme with them.
I wish I could be there! I know it's going to be wonderful, whatever you decide!