Ugly Greenhouses

I think this is the best thing I've done so far for starting my own plants. As you can see, I'm putting my seedlings outside in totes covered in plastic. I've had to keep a careful eye on them as they heat up fast when the sun is out. When the sun comes out I go outside and pull the plastic back in places or take it off completely if it's really warm out (70 or so).
My plants are getting adequate sunlight so they are not long and leggy and will already be hardened off when I am ready to plant them in the garden. I've also noticed increased germination rates.