Thistles are surprisingly edible once you get rid of their 'armour'. These ones are supposed to be particularly good.
I've tried the leaves and roots of Scotch thistle and winged thistle - although it wasn't too successful. (A lot of work for very little return - I think it was the wrong time of year).
I haven't tried variegated thistles like the one above though. It's one of several spectacular specimens growing near us (stunning with their silver splatters all over their leaves). Unfortunately they're growing in a place that I wouldn't forage from.
Variegated thistle links:
Plants for a Future Database
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