The original design is StyleShout's Colourise 1.0, awesome work from Erwin Aligam. I had modified text color scheme and typography to be more legible and more suitable for both Latin and Thai characters (my native).
Due to the layout had been radical changed for the new release (colourise-6.x-2.x), so I have to remove the 960GS framework from the theme. But I got some new idea for theme layout from Holy Grail Layout and code sample from Drupal Basic theme. If you are a web designer, those stuff I've mentioned above will save your life from the vast time consuming job, like creating Drupal theme.
Branch 7.x-2.x is being worked on at the moment by yashadev for its final release. No new features will be added in 7.x-2.x branch; so it will be a straight port from 6.x to 7x.
7.x-3.x features list
Since the theme was re-written almost from scratch, you have to reinstall the 3.x theme. First of all, if there are any feature requests, please create an issue so I know. Right now, extra regions (menu, header) will be added. As specified above, Holy Grail Layout and code sample from Drupal Basic theme will probably be integrated. It will depend on the features that will be requested.
Please backup your old modified theme files before upgrading to the new version (6.x-2.x). There are so many changes from previous version (6.x-1.3). Anyway, you can add your customized CSS style in "custom.css" (blank file inside the theme) then activate it in the theme settings configuration.