checkbox: Islands theme

![1](https://f.cloud.github.com/assets/1333220/1808571/3cac9100-6d60-11e3-87f0-116609e64200.png)
![2](https://f.cloud.github.com/assets/1333220/1808572/3ce5d87a-6d60-11e3-81e7-f7b91ad5e71a.png)