There were a couple people who have tried starting seeds inside only to have their cats knock them over or eat them! While my dog wants nothing to do with our plants, we do turn the heat down significantly while we're gone so our seeds usually have a tough time getting started. Here's a recycled greenhouse idea that I think might help remedy both problems.
JoeysPlanting Flickr stream has some great ideas on sowing seeds and utilizes a great rotisserie chicken container.
You could either place your potting medium directly into the container (though drainage might be an issue unless you make holes and use a drainage plate) or place smaller containers (part of an egg crate?) inside your new greenhouse.
There is also an Instructables that details the steps to a great mini recycled greenhouse - here are some photos below:


oh, rotisseries chickens. yummy dinner, sandwiches for work, soup with the leftovers, and now a greenhouse? who could ask for more?
view foodefafa's profile
Ha ha! I have the cat problem too, and do the same thing.
view whytephoenix's profile
Neat idea! Neat post! It always bugs me when I throw out my Costco barbecue chicken boxes. Never thought of using them as seed starter "greenhouses".
view Greenscaper's profile