There are many recipes for Italian Pink Sauce (Pasta Rosa). Most have you add cream to a marinara type sauce. My favorite way to make this is just to combine your favorite red sauce (like the crockpot Marinara) and your favorite white sauce or Alfredo (like the Cashew or White Bean versions) in a ratio of about 2 parts red sauce to 1 part white sauce. My kids love this!
*I also like to make lasagna this way—either mix the two sauces, or alternate layers of white and red sauce as you assemble the layers.