Visually appealing colour combinations are not always easy to make. But there are a number of websites that allow you to generate good looking colour combinations.
Siteprocentral’s color combination tool is very impressive. It allows you to automatically generate complimentary, monochromatic and analogic colours based on the colour you select. You can vary the hue, saturation and brightness to get the colour you like.
Colorcombos.com allows you to compare colours and generate various combinations. It also generates basic templates from your choosen colour combo.