I wouldn't call it yellow. More of a lime-saber.
Chartreuse. Looks cool for her to have two sabers, one long and one short.

Funny how you have to be careful about color coordination. Wouldn't want green and red for instance, that's Christmas! Green and purple: ech, preppy. Red and purple would clash. And then there are also the ideological concerns.
Anyway, I think it's kind of missing the point to argue about what the prophecy "really" meant as if there were an objectively right answer. If Lucas had had a specific, unambiguous meaning in mind, that probably would've been stated onscreen. Since it wasn't, the prophecy was probably meant to be ambiguous. (Though admittedly maybe that's giving Lucas too much credit as a writer.)
I have the distinct impression that the PT said pretty unambiguously that balancing the Force = wiping out the Dark Side. I remember this because I thought it was hogwash!

That's a Westernized notion of the battle between good and evil, and Taoism is so much cooler! So did I get that idea from fan discussions after the fact? I can't remember where I heard what about anything.
Anakin fully unleashing his power was amazing and the first time he's really fit the whole Chosen One image to me throughout the Prequels and Clone Wars.
Absolutely! In fact, I was thinking, whoah, I'm not sure I can believe Vader was ever that powerful. He's downright godlike. So we've gone from the PT where Anakin seemed too much like a pathetic weakling to synch with Vader, to someone who if anything is overshooting the mark!

However, I'd much rather have him overshoot the mark. We can assume that being crippled on Mustafar ratcheted down his power a bit.
If they were not forever standing on the precipice to the dark side, and instead lived somewhere off in the clouds, the Jedi order would not be the most valuable recruitment camp for the Sith.
It's probably an unintentional irony but I've also noticed that the Jedi are asking for trouble by declaring that attachments will lead to the Dark Side and then sending their people into battle. Fighting alongside others is a surefire way to form deep bonds. If you're serious about no attachments, send your people to go live in monasteries and gender segregate them for good measure. Don't mix with normal people and above all, don't send your people into battle!!!
Stories about prophecies usually rely on the characters misunderstanding the prophecies until it's too late, because if the meaning were crystal-clear, there'd be no suspense.
That would be a great way to handle it - the Jedi can't really understand the Force or accept that balance means that the Sith need to exist, and they'll never wipe them out entirely - so they misinterpret the prophecy to mean "Anakin will wipe out the Sith, hurray!" when it actually means "Anakin will help the Sith become more powerful to balance the Jedi" (and maybe "and then Luke will rebalance things when the Sith become too powerful, and then and then and then because this never ends and if you think it's going to end, you don't understand what 'balance' means.")
But is this the case? The question is not so much What is the prophecy as What is the purpose of the prophecy in the story?
It can be very satisfying if a storyteller deliberately leaves something ambiguous enough that the individual can decide for oneself what it means, rather than simply being told what it means.
If you think that that ambiguity is a deliberate function of good writing rather than an accidental artifact of sloppy, lazy writing.
