just to note: there's nothing wrong with simplicity, it's just hard to do well without applying your own personal quirks to it.

after you've been designing for a while - you're past the whole 'let's try each kind of style (grunge, tech, web2, "corporate", whatever style)' phase, you'll notice there are certain things you do similarly throughout each style (type arrangement, form/layout, etc). those are the quirks that give your design that personality edge.

unfortunately you can only develop that with time.