Making an awesome looking map is a lot of work. If need to do a simple map very quickly there is a new tool which might help you. Pixel map generator by amCharts allows you to create a custom pixel map in couple of clicks.
It offers several simple customisation options. You can select sizes and distances of pixels. Customise colours and change colours per country. The output can be downloaded as PNG, SVG or HTML.
Really cool and worth checking out.