Farfalle, penne, fusilli, or another short pasta can replace rotini.
Walnuts or pumpkin seeds make excellent alternatives to pecans. Pumpkin seeds are particularly useful if you want a nut-free version.
Goat cheese can replace feta for a softer, creamier flavor, provided the cheese meets your dietary requirements.
For additional greens, gently fold in baby spinach or arugula shortly before serving.