Hi "Super Mom"! I read your blurb "a little about me" and what strikes me is that you already love to do this stuff, so why not transfer it to the kid-o's? By that, I mean, if you scrapbook (like I do) chances are good that you also make cards. SO, design a very easy simple winter theme card...like a snowman one with little snowflakes they can put all over it. It will cost a very minimal amount and be something that everyone can do without a whole lot of difficult steps or instructions. Of course, some might read this suggestion and feel that it isn't "BIG" enough or different enough or...well, a whole host of reactions. And, generally I would be one of those people 'cause I tend to want to do things on a grand fashion. BUT I'm trying to simplify life. The truth is, the kids are going to LOVE anything you do because it is different from their normal schedule. They will embrace whatever you do with them. Your son will simply be amazed that you are standing there in his classroom with him. He'll love it! You could do something more complicated, but odds are you will be more stressed, need to prepare more, perhaps be frustrated with kids that are energetic and not able to follow some of your instructions, etc. The thing is, don't make it bigger then it needs to be. Enjoy the moment and the time with your child by choosing something that you are comfortable doing already, will allow the kids an opportunity to create something simple but individual and won't tax resources, time or patience. I'm sure whatever you decide will be wonderful. There are probably some amazing suggestions on here (I'm anxious to see them myself) but if there seem to be things that are a bit on the grand scale, save them to do with your kids on your own and make something that has very few steps or precise steps with the large school group. You'll be glad you did it.