Not sure if the variegated I have are edible or not.
The nursery where I got them left me the feeling that they aren't.
Although, I think bigdog may have the same kind... that's very much what they look like. His seem to have more yellow than white though. Is that just the photo lighting? (When taking pictures straight down, sometimes the color dosen't come out as if you take it from the side.)
None to trade, sorry
Here's something similar on ebay that might satisfy
http://cgi.ebay.com/Bromeliad-Varieg...QQcmdZViewItem
