Emotion UI on Huawei devices lets you change the style of entire icons rather than just one specific app's icon. To change the application icon style on Ascend P6, do as follows:
1. Open Themes application
2. Tap the "Customize Current Theme" button on the bottom of the page
3. Tap "Application icon style".
4. Scroll and Apply the icon style you like
5. Apps icons have been changed