I have little treat bags for the parents. Last year it said "Your children are real treasures. Thanks for sharing your wealth with me." Inside I filled it with treasure candies. It was a nice way to break the ice.
I also read the book Seven Blind Mice. We talk about how you need to look at the whole picture and not piece by piece. I related this to how they need to look at their child. Piece by piece they might find flaws, be disappointed, misjudge, underestimate, etc... But looking at all the pieces together make up a very wonderful child. If I can get into school I will look for the exact analogies I used.
Another year I passed out a few real and a few fake apples and did a little mini-hands-on science experiment. My point was to show them how fun it is to have real objects to experiment opposed to just looking at the fake on. I then pointed out that their donations throughout the year make learning so much more fun. HINT HINT mom and dad- send in the things I ask for. It really works.
I also have a slide show that shows past years' activities so they can get a glimpse in how I run my room and how much fun the kids are having. Also in this show are things I need to let them know about- curriculum, policies, expecatations...
Lastly, I have them write a letter to their child wishing them luck, sharing a story, complimenting them, etc... These notes are tucked into toilet paper tubes that the kids have made to look like themselves.