how do I change the color of my template

I like the green, but I would like to change it up a little, so its not to bland.. I want to change the color, how can I do this? I also would like to change the background also...
bargainsbykeith.com
thanks!

The green is an image tile_back.gif open a copy of this in your graphic editor and change it to what ever you want.

When you say background color this can be interpreted in different ways: All are in the stylesheet.css file; If the color surrounding the standard template then this is:

body {
	margin: 0;
	font-family: verdana, arial, helvetica, sans-serif;
	font-size: 62.5%;
	color: #000000;
	background-color: #e5edf5;
	}

If the centered area color this is:

#mainWrapper {
	background-color: #ffffff;
	text-align: left;
	width: 750px;
	vertical-align: top;
	border: 1px solid #9a9a9a;
	} 

thank you but where is the graphic editor? so I can change my color from green to a blue?

To edit images, you need a program like Photoshop or PaintShopPro.

You can change the colors by editing the stylesheet as kobra indicted.

Download the Firefox browser (it's free) and get the webdeveloper addon for it. It'll allow you to play with the stylesheet and see the result immediately.