We use Sublime Text everyday and got tired of seeing the old icon. For this reason we designed our own along with icons for different filetypes that we use.
To change the icons of your filetypes go to Applications and right click on Sublime Text > Click "Show Package Contents" > Contents > Resources and move the icon files into that folder.
To change the icon for Sublime Text just open up the info panel of the SublimeText-icon file, click on the icon and press ⌘+C, go to applications and open up the into panel of Sublime Text, click on the icon and press ⌘+V.
If you want us to create an icon for a file that is not yet in the list then please submit an issue and we'll create it as soon as we have the time.
Current list of file icons:
COFFEE
CSS
HTML
JS
JSON
MARKDOWN
PHP
SCSS
![In dock] (https://m1.behance.net/rendition/modules/107102415/hd/c72f1b83ba0978cb08915627f34edeba.png)