After 8+ years of scrapping I finally found a groove and a somewhat defined "style." I figured it out buy realizing 1) things I almost always have on a layout have on a layout (journaling and white cardstock) and 2) things people kept consistently commenting on about my pages (clean, graphic, journaling)
This mix of thinking of what I often do on my pages provides a "base" for my layout. Every layout, though, is different as new products come out, I learn new techniques and I broaden - a little.