4.8 Sky is the limit
The number of fractals, even those built from two transformations, is literally infinite.
It is worth experimenting with them!
\[
f_1(x, y) = \begin{bmatrix}
0.202 & -0.805 & -0.373 \\
-0.689 & -0.342 & -0.653
\end{bmatrix} [x \ y \ 1]^T
\]
\[
f_2(x, y) = \begin{bmatrix}
0.138 & 0.665 & 0.66 \\
-0.502 & -0.222 & -0.277
\end{bmatrix} [x \ y \ 1]^T
\]