Do it!I love grey on walls,it's clean and quite relaxing and a million times better than magnolia,cream and bloomin beige!
My living room and dining room are pale grey (dulux polished pebble) with plum and pewter feature walls,oak furniture and plum accents.
Ds room is pale grey (polished pebble again) with a bright green painted feature wall then the same on the alcove on the opposite side of the room.White furniture,green desk in the middle of one wall and green curtains, on the Windows either side of the desk.black white and grey stripey carpet- looks awesome!
My bedroom is pale grey (yep,polished pebble lol) with a grey and black gorgeous tree/bird print vertical pattern papered feature wall,black gloss furniture,black curtains then crisp white bedding with green and light teal bits on it,then green and light teal accents.Wanted red but it would look a little odd lol
Hall and stairs are a greyed white with black and white flick carpet/maple laminate,and Harliquine Silhouette wallpaper as a feature wall (went for the metalicy matt silver background) and looks lovely.I could marry that wallpaper I love it so much lol
Kitchen and bathroom are greige because grey wouldn't go with the units and tiles!
Grey is great for decorating and just a few bits of strong colour look amazing against it.