Getting used to the new Start Screen in Windows 8? It’s basically composed of a bunch of tiles that are either static or “live” tiles, which means they are updated in real-time with various types of data. I kind of like the new tile interface, but I hope Microsoft allows more customization of the Start Screen by the time Windows 8 is released.
Move & Rearrange Tiles in Windows 8
Moving tiles in Windows 8 is pretty straight-forward. Just click or hold your finger over the tile and drag it to a new position. Note that there are tile groups and you can drag and drop tiles between different groups.
If you drag the tile within the same group, it will just just rearrange the other tiles by pushing them down. You can create as many groups as you like by just dragging a tile to the far right where there are currently no tiles.
"Computer Tips: Windows 8 Tile Size Change,Rearrange and Move"
Reference : online-tech-tips.com