CodePen has amazing examples that are an inspiration for how to use CSS3 in ways that will inspire you. The code at times needs to be compiled (so it looks like the HTML or CSS you are familiar with) Here are some examples. Poke around, and send me any additional examples you find compelling.

Pure CSS Parallax

See the Pen Pure CSS Parallax Scrolling by Keith Clark (@keithclark) on CodePen.

Animated Interfearence Patterns

See the Pen Single element Atari ST demo effect by Keith Clark (@keithclark) on CodePen.

CSS Shapes

See the Pen CSS Shapes by Bryan Robinson (@brob) on CodePen.

Playing with CSS Filters

See the Pen Playing with CSS Filters. by Sam Jarvis (@samthejarvis) on CodePen.