Here are some online CSS tools that Drupal themers might find useful.
– CSS Box Model Tool: http://www.cssmatic.com/box-shadow
Allows you to adjust border radius, box shadow, and noise textures
– CSS Gradient Generator: http://www.cssmatic.com/gradient-generator
Allows you to build CSS or SASS gradients similar to as in Photoshop or other tools. Has a number of presets to start from.