Coolhand Luke Theme
Apache Flex Theme
This is a Flex 4 theme. You can download and use just give credit.
Once in place you can set a few properties via css to edit the look of the theme:
global {
themeColor : #00B9F2; /* this is for MX components */
chromeColor : #00B9F2; /* this is for Spark components */
fontSize : 12pt;
}