Adding a "touch" in .postinst would set the timestamp to the current date and 
time which should trigger a rebuild of the cache.
The only issues with that is that:
 1) We are (kind of) modifying a file post-install (although the checksum will 
remain the same so won't really be considered as a change)
 2) We'd need to patch every wallpapers package to include that fix

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https://bugs.launchpad.net/bugs/746028

Title:
  Edubuntu: Wallpapers are not updated on upgrade to Natty

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