I have seen variegated Iris with purple flowers, but I'm wanting one with white variegation and white flowers. Does this plant exist? If not, what are some good white Iris?

http://wiki.irises.org/bin/vie... it looks like there is one with white flowers, and YELLOW variegated leaves.

Try "Sub-Zero"

It is a recent introduction by John Van Hook.

Sub-Zero TB 2015

That's actually a sort of question that the Iris Database is designed to easily answer. It looks like there are at least four:
http://garden.org/plants/group...

I have one called Striped Britches...
Couldn't get a decent picture of it this year... but you can get the idea.. Seems to be about the same size as the variegated pallidas... maybe a little shorter at IB size. this is it's first year..

Thanks to all who replied. I know about the database; however, I actually wanted to know which ones people had grown and would recommend. I wish the database had a feature in which we could rate our plants.

Also, if you're wanting just white.. I've had Lacy Snowflake for probably 20 years. It's reliable, a good grower, and pretty as well. An older white that I'm fond of is Skating Party. It has a lovely grace about it. I've tentatively identified one of my historics as Matterhorn. Whatever it is, it's a great grower and is very floriferous. I'm happy to share/trade any of these.