I believe creating a consistent look across various online platforms is very important. A quick way to update your Facebook Page is to change the default app icons that show in the left sidebar. Let me show you how... it's so easy you'll wonder why you haven't done it before!
Click More in your timeline navigation
Click Manage Tabs
Click Add or Remove Tabs
Click Edit Settings for the app you'd like to edit
Remove Default Icon & Add Custom Tab Image (111 x 74 pixles)
Note: Once edited there isn't a "back" button. Just close the tab and know that it worked ;-)
Repeat for all your apps!
Extra: If you want to rearrange the order of your apps (also Page navigation), stop at the Manage Tabs step and Drag to Reorder.