The bottom plant is a "pretty speckley thing". Actually, once upon a time when I used to work in an independant family-owned home-depot type store, I probably could have ID'd it, but now I have no idea.

The terra cotta pot you re-planted your spider into will eventually get really gross looking from the water seeping through and leaving hard water deposits. It should do a much better job of keeping your plant healthy though.

All those trimmings off your pothos could be planted and many would take root and grow. I think you can stick them in a glass of water with a tiny bit of fertilizer to see which ones start growing roots, and then plant them.

The neat thing about many house plants is they actually clean the air in your house. Not just the exchange of CO2 for oxygen, but they also remove other stuff from the air. I remember that spider plants and pothos are both supposed to be good at it.