You can change the entire look and feel, can able to add button / event / can do anything with it. Read documentation here or more example here
Usage:
$('.editor').easyEditor({
buttons: ['bold', 'italic', 'link', 'h2', 'h3', 'h4', 'alignleft', 'aligncenter', 'alignright', 'quote', 'code', 'list', 'x']
});
$('.editor-another').easyEditor({
buttons: ['bold', 'italic', 'link', 'h2', 'h3', 'x']
});
$('textarea[name="editor"]').easyEditor({
buttons: ['bold', 'link', 'h2', 'x']
});