I think mine is shadowing. I didn't care for digi scrapping when I first started b/c my pages looked so flat and boring....then I discovered shadowing and I fell in love with digital scrapbooking. Probably b/c I had been a paper scrapper for years and was used to creating dimensional pages that the flat look didn't appear to me. But shadowing brought me back into my comfort zone of having the allusion of depth and dimension. Funny thing is though, as time went on, I grew to also like a flatter look, and didn't need as much dimension, depending on the page design.
Also, I am a freak about color. I try to make my colors just the right tone, the right saturation, and usually love a bit of contrast/pop to finish my page.