I almost started this post with the line "Largely forgotten today, Colleen Moore was one of the biggest stars of the silent era ..." but then realized that with the exception of Charlie Chaplin, Buster Keaton and maybe Greta Garbo, that's true of every silent film star.
So I'll just say Colleen Moore was a big star and was a bigger influence at the time on the classic "flapper" look than Louise Brooks ever hoped to be. That said, she's probably best known now, if at all, for her "Fairy Castle," a 9-foot square, 12-foot tall dollhouse which is on display at the Museum of Science and Industry in Chicago and is viewed by 1.5 million visitors every year.
As always, I think the best way to get to know a film performer is through the work. Here is a clip from the 1926 comedy Ella Cinders which I hope will inspire you to seek out more of her films: