None, really. I don't see the appeal in the whole 'mansion, designer clothes, new Bentley, lines of coke, vintage wine' lifestyle. I'd still buy clothes from charity shops (but sh1tloads more of them), live in a single-storey house, drive old cars (I genuinely hate driving new ones), shop at the same supermarkets, and hang out with the same people as I do now. And class-A substances don't appeal in the slightest.
Actually, I should expand on the cars - I would actually buy as many as I could physically house in barns & garages around my house, and then several more. I wouldn't buy expensive cars for the sake of being flash, but unfortunately a number of my dream cars ARE bloody expensive. None of them are Bentleys, though.
Seriously, although there are a lot of things I'd spunk money on, most of my spending wouldn't be obvious to people around me, and I have enough friends already that like me when I'm skint.