Patricia Neal was a true beauty. Sadly, my direct memories of her stem from commercials she did in the 70s, I think they were for Polident or denture cream or something, and Anacin I think. To this day it's what I associate with her!
To shake that (horrible) image from your mind watch her in:
"Hud" for her raw, honest and not salacious portrayal of sexuality
"The Subject was Roses" for her ability to deliver a range of emotions and unspoken poignancy that is stunning (albeit in one heck of a depressing movie)
"The Fountainhead" to see her at the peak of her physical beauty.