There are a number of people around the XDA forums that have blacked out apps. Heck, our very own B-boy™ has 7 various Google Apps inverted in our forums for you enjoy. The only one missing from his collection is Google Voice. That is where we find XDA member ChrisJ951 adding in his own little twist and addition to the community. He offers up two variations of the Google Voice apk for you to side load to your device. One offers up what you see above, the second leaves the name/number white instead of changing it to blue.
Both can be located at ChrisJ951′s XDA thread.