My friend applied this year for Fine Art, and had an offer. I'll try and remember some of the details...
She applied to Magdalen but was pooled to Teddy Hall. I think she said there was only 1 place for a Fine Art undergraduate at M. while there are about 7 possibly at T.H., so I assume if you apply you'll probably be interviewed there. It was an AAA offer and she's taking A level's in Art, German, Welsh and English Lit - so a foundation course post-a level isn't always neccessary, neither are 'typical' a-levels. She sent off a portfolio which was discussed at the interview - apparently they like political meaning (?) and in her case performance art. She has high grades in dance - ballet, tap etc. - which judging from the feedback, would give a different perspective/dimension to the course. So when you're writing your personal statement, 'talk up a relevant, slightly unusual extra-curricular activity'.
There were two interviews, and a practical exam. I can't remember much about the interviews, only that she was asked how a Welsh person would look upon the hills differently. And always answer 'no' to a query about if you'd let a big corporation sponsor you. The practical exam sounded like fun - they were given a quote from a surrealist poem, and then had to paint a reflection of it, and another task was to draw the room they were in.
Hope this helps a little.