Wearing all black is never a bad idea - and sometimes I gravitate towards that monochrome look, like in these outfits here. Wearing all of the same color also makes getting dressed easier, since you've already narrowed down your choices - all black, all white, all grey (Jenny Tsang does it so well here) - it always looks more polished. You can make the outfit interesting by adding different textures and shades.
For this outfit, I built on the basic t-shirt and jeans by adding over the knee boots and a jacket with details. I'm wearing this quilted bomber jacket from Gap (its on sale now!), and the leather boots are from All Saints (I've picked out some similar ones below). It's hard for me to pass up anything quilted - I have this jacket in 2 colors :P