Mystery solved, I think. Golden laced Sebright banty.
Blackbird12, you askd if it would become a LF or banty; Sebrights only come in banty size, so it's going to be a banty.
http://www.feathersite.com/Poultry/CGP/Sebr/GSebrightChix.JPEG
Sorry, that doesn't look like it. The wings on the GSH are too patterned, don't you think? I see white patches on the GSH, but not on the mystery chick.
The first two are partridge cochins. Blackbird12 is right, I googled several pictures and all of them match.
The third is probably not a golden lakenvelder. See here: http://www.feathersite.com/Poultry/CGK/Lakens/GoldLakChik2wks.JPEG
I'll keep thinking...