Try River Island if you have one near you. I went there on Saturday and they had loads of grey drainpipes, there was also a lot of stripey tops with printed gold or silver fronts very funky.
most colours go with grey, try black and matichin stuff like your belt and bag to your shoes if all else fails. My friend has got the best gold bag from New Look and it looks fab with her grey trews and gold belt. You could also try bead necklaces, golds and silver are really in too....hope this helps a bit....bargain on the trousers though!!!