The quick answer is that I think it will all look great - particularly in a pepper white/black car. That said...
I LOVE my leather lounge seat (albeit in grey). They are very comfortable yet supportive. I also really like my MINI yours steering wheel - it's very grippy and looks good. And the 3rd gen normal headliner is more grey and less tan than shown in the configurator - I think it will accent the off-white nicely.
I read someone's post (sorry I don't remember which thread) who got the MINI yours off-white and LOVED the dash pieces - they have a very cool perforated texture/look. The other pieces he just liked - a more straightforward off-white gloss. Also, I really like the lower middle dash pieces which the off-white interior style offers (and no other).
As for pictures - I found autotrader to be a great resource. Narrow down the MINI search criteria then keyword for 'off-white'. You'll get some false positives but it should point you at dealerships that have a MINI w/off-white for sale. Then go to the dealership's website and look at the (usually) better pictures.
