The ObjectFiller contains also tons of sequence generators, like the SequenceGeneratorInt32 or the SequenceGeneratorDateTime. When used without any particular setup, they will simply create an increasing sequence like [1,2,3,...]. Most of these sequence generators can be customized to use a different start value (From), a different increment (Step) or can even wrap around after hitting an end value (To). The Step property can be even set to a negative value to generate a decreasing sequence, like in the example below.
public void Countdown()
  var generator = new SequenceGeneratorInt32
                                     { From = 3, Step = -3 };
  generator.GetValue(); // returns  3
  generator.GetValue(); // returns  0
  generator.GetValue(); // returns -3
  generator.GetValue(); // returns -6