Congratulations on your new purchase ( cheaper than I paid for mine earlier this year but I got mine cheaper than average on ebay because it was a 220v motor, ideal for me as I live in Ireland, and that's what we need). The tan ones are fairly pale tan, and according to the book I have, a green one is a myth - none has ever been found, but the author thought perhaps it was because the white ones sometimes have a pale green tinge to them (sometimes called celery).
The foot you pictured lookd to me like a zipper foot, but if it is, I doubt if it is for this machine, because the needle on this doesn't move from side to side. If you put it on the machine and wind the needle down by hand VERY GENTLY, you are likely to see that the needle is heading down to break on the foot.