Well I really love the MetroUI in Windows 8 but is there any possibility to resize the tiles ?
You can make them half the width but I'll assume you'll actually mean more than that; so, you can also change how many rows of tiles you have, effectively resizing them to fit less or more on the screen.
Create or edit the DWORD(32-bit) value
There are also some other settings there, you might play around with
Old question but may help someone.
Windows 8.1 contains refinements generally received well, for some of the "rough edges" of Windows 8. (It's hard to bring in something new and get it perfect in version #1!).
The refinements in Windows 8.1 include New UI tile resizing and scaling (within limits) which may answer the question.