Flat design is the big trend in graphic design at the moment, and it is great news for the layman designer. You can stop worrying about what you thought were “sophisticated” graphics: 3D, drop shadows, gradients, reflections.
Take the Microsoft approach for example: blacks and greys, one bright accent color, tiles spaced out in a grid, thin font, sharp edges. Perfect for a presentation look and very easy to replicate. Resist the temptation to make it “sophisticated” again…
If you are interested in the Microsoft design revamp, here is a 45 minute video that provides a look in the kitchen: