The pin grain is beautiful - have it as an accent on a pair of Oakhams. For me personally I think it's just that G&Gs are so sleek and 'urbane'. This seems to somehow conflict a bit with grains and pigskins. Although some will certainly work. I'm particularly fond of the mix of suede and pingrain - I think they've done some makeups like that in RTW. Check the Bespoke England site they have some RTW makeups in a few models. Even if there isn't a config you like it might help to see them to get an idea.