Neat envelopes: printable envelope templates are all over the internet and they tell you to get "pretty paper" i think newspaper or colorful pages from magazines look really neat!
Setting the tone: during the holidays it's always really nice to have great Christmas music playing. I suggest www.pandora.com and choose "Eliot Smith Christmas" radio. It's great new Christmas tunes! Another good one is Barry Louis Polisar and Rafi radio for kid time :)
DIY Silly Christmas Photoshoot: Cut giant holiday things out of chipboard (thin cardboard - painting them is optional) and pose your kid(s) with them and snap some silly photos for Christmas cards instead. Great ideas: Giant ornament, antlers, snowman with a hole for your kiddos face hehe, the posibilities are endless..
Also if anyone is interested in some Holiday Card templates made by me - let me know (email@example.com)