qVariantFromValue should also be a Qt module function, as it doesn't actually care about the exact value of self. This
would allow constructs such as

class Object
  # Easy conversion from any value to Qt::Variant
  def to_variant
    return Qt::qVariantFromValue(self)
  end
end

  Then, it would just be necessary to write 

stuff.to_variant

instead of

Qt::Variant.new(stuff)

of

qVariantFromValue(stuff)

  What do you think ? (the attached patch should do the trick - not much to do anyway...)