object_create.rb

def Object.create(attrs)
  obj = new
  obj.singleton_class.send(:attr_accessor, *attrs.keys)
  attrs.each do |name,value| obj.instance_variable_set(name.to_s.sub(/\A@?/, '@'), value) end

  obj
end

o = Object.create(foo: 12, bar: "hi") # => #<Object:0x007fc53a0f7bc8 @bar="hi", @foo=12>
o.bar # => "hi"
o.bar = "foo" # => "foo"
o # => #<Object:0x007fc53a0f7bc8 @bar="foo", @foo=12>