Since reading about winter sowing (on Get Busy Gardening), I have not bought seed starting trays this year. Instead, take-out tupperware containers, and clear-lidded plastic containers, are my mini-green houses of choice.
Upon assemblage, it was clear that two lights weren't going to cut it for my monstrous garden plans; so I picked up two more lights to expand the system. When I got them home, I realized one was the wrong type of lamp, so it's on its way back to the store. A third light, however, allows for a few more seedling trays.
This may be geeky, but with snow on the ground and spring frustratingly flirting only on Mondays through Fridays, planning the garden is a real mood lifter. ...Even if there are only a few hours a week to spare...the plan is big this year. We'll see how it goes.