Yes, you need upload a new image with another color into wp-content/themes/woopress/images/ folder
and change code in custom.css file for this
background-position: 0px 0px;
YOUR-NEW-ICON – here you should insert the name of your image.
Here is a video tutorial how to create custom.css: https://www.youtube.com/watch?v=Qok2zRedRMY&feature=youtu.be.