Note: this page lists features of Click&Clean that are deprecated and obsolete. To change Click&Clean appearance, please look at "Change the Appearance".
First of all you need to know that Click&Clean has several choices for you and your inner creativity. You can change default icon anytime you want and you are free to select any icon you like or even use your own image. Just few steps and it will be displayed on your Chrome toolbar.
By default, Click&Clean comes with original Eight icon set (see image below), but if you want more, you can get more icons from freely available sources, for example: 40 Free And Useful Icon Sets.
All you do is open up the options and just click on the icon that you want to see on the toolbar. If you want to use your custom icon, click on browse [...] button to display the Choose Image dialog box, which allows you to select desired image to be set as the toolbar button background.
Currently supported image format are PNG. The standard image size for the Chrome toolbar button is 19x19 pixels. There aren't many pixels to play with, but if you supply a larger image it is automatically scaled down to have no dimension greater than 19 pixels.