that allows you change the color scheme of a theme? Or there's no lazy man way out of having to manually change the CSS yourself.
try a theme switcher. then make different colour versions of the same theme. wordpress.org/extend/plugins/theme-switcher/
as if changing CSS is some grueling hard experience! it's CSS. I think what he wants is to find somebody who's made a plugin so HE can change the colours in his CSS without opening the small text file up and plreacing the numbers. Let me tell you, if you're that afraid of CSS you probably don't have the chops to be managging a wordpress install, which frequently requires little touch ups in PHP and HTML and CSS from time to time. If you don't know CSS, check out W3Schools.com and learn it - it's so so so so simple. Also note, if there are any images used in the layout, you may need to use an editor like GIMP.org (or Photoshop if you have it) to update those graphics so they match the new colours.
No there are no color scheme plugins available.You have to change the css file.Always backup the file before making changes.