I use toilet paper tubes cut in half for seed cups, and after the seed sprouts I transfer it to another cup made from newspaper about 3in tall,and 2-3in in dia. when they are ready for the garden I open the bottom up and put the whole thing in the ground.I have some that I sprouted in my incubator and just this morning put them outside in the sun, 84 degrees in michigan in march, who'd a thunk. I'm usually still ice fishing this time of year. Next week I will start my tomatoes and cukes in the incubator, it works great, always 90 degrees plenty of light.
What neat idea. I never thought of that.