No. This challenge is open to all software. tresamie has entered fractals in this Challenge for several months (and has won some of the challenges...in fact, several fractal artists have entered it freely). It is not limited to modelers. It is not limited to 2D. It is definitely open to fractal artists as well as modelers (Bryce, trueSpace, Wings, etc.), 2D, photographis, and 3d artists. Everyone is welcome to either enter or vote...it is a challenge to creativity and imagination for all. But thank you for the opportunity to explain it in more detail.