I agree with DSADE in that strictly from a "physical" stanpoint, or appearance, I don't think it would really matter, or does it?
The body requires a lot of different micronutrients for efficient metabolism and to carry out normal physiological processes. Many vitamins and minerals, among other things, play a direct role in physical performance, which can in turn affect physical appearance.
Making up for deficiencies not obtained through the diet, which will occur if your eating the same foods over and over, with supplements is a good idea. However, the nutrients contained within foods, mainly fruits and vegetables, work in a synergistic fashion when taken in together. Synergistic meaning that the effects of combining certain nutrients is greater than the sum of their individual effects. Multi-vitamins are a great idea, but can in no way make up for the benefits of obtaining them through a varied diet.
Eating a wide variety of foods will definitely benefit you both in and out of the gym, and both physically and from a health standpoint. And, it would definitely be a GREAT idea to add fruits and vegetables in the mix. They provide many benefits other than vitamins and minerals. They contain fiber, are low in calories, and are packed with phytonutrients. Think about it from a long term health perspective and imagine what kind of effect it can have on your physical performance and physique in the short run.