You can't get much more democratic than different chairs around a table. Each chair as unique as your guests. I have shied away from the armchair & sidechair dining set. The armchairs seem a little snooty. My opinion, use all the same chairs or use all different chairs. Some things to keep in mind when trying this look: Use color, style, shape, fabric or something to unify your chairs. A pair may be helpful in rounding this look together. You can also make cushions for all your chairs in the same fabric. Or if you already have a matching set, make cushions or change the upholstery to different fabrics to achieve a similar look.