I love all these set ups but I'm far too lazy for such things, I generally plant my all my seeds in whatever I can pull outta the recycling bin! I'm also not growing giants or stuff for competition so I feel like I can use recycling for my stuff. So far so good.
Yogurt cups work well for me as do salad containers, cut up milk jugs, basically anything that's not metal. I also have some actual leftover planting things from buying past years garden stuff & annuals. I keep the flats they come in & just line 'em up in those so if I have to bring them in I can just pick up the flat & move it inside.
One year I forgot to label the planters so I had about 10 different kinds of peppers, from plain ole green to hot ones, & had not the first clue as to what was what. It was an ever evolving mystery for a few weeks so it was kinda fun!
I have also harvest the first 4 pieces of asparagus of the season!! We ate them raw & it was tasty!!