A designer made a design for a portal and in this design a lot of the SharePoint icons had different colors than the orginals.
These icons are located in two spritzs: spcommon.png and fgimg.png. I downloaded these sprites and changed the color of the icons which are used in the design.In my css-file I added the following styles
The idea is to hide the image by changing the size to 0x0 pixels. After that you use padding to change the image to its original size. With background-image you change the image to your own pcommon-customer.png and img-customer.png.