Equipment
USB
Any Picture has to be .PNG File and 64x64 and 32x32
Horizon "If u dnt have it" Download it Here XboxMB.com
XBL Profile

1st
Plugin your USB to XBOX then move ur Profile to USB
2nd
Open Horizon, Click on Explore Device, Select Gamer Profile, Double Click on Profile "Your Profile should Show up, Click on Contents"
3rd
Look for a tile_64.png and tile_32.png, Right Click on it and Select Extract it save to your Desktop.
4th
Find any Picture you like has to be .PNG Re-size it to 64x64 and 32x32 then Rename it to tile_64.png and tile_32.png "you probably get the Idea which is which to rename it to"
5th
Go back to Horizon, Right Click on tile_64.png Select Replace, Message should Show Up click Ok, same thing as tile_32.png
6th
Save, Rehash, and Resign, Unplug the USB, Plug it back to XBOX, Turn your Xbox On.

PROOF
XBL doesnt have or Sell Sharingan Gamer Picture and SORRY for the BAD Quality
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NOTE: I am NOT Responsible If your Profile Get Corrupted or Banned from XBL and Sometime the picture seems to Small So find a Right Picture that is on 64x64 and 32x32. I use Icons.