I've always recognized the Roseville Pinecone pattern. It's very pretty, and easy to recognize, you just look for a pinecone. I knew it was their most popular pattern, and it's still highly collected and sought after. However, until reading the book above I didn't know it was originally rejected by Roseville when it's creator, Ferrel, first made it. The sample was rejected and placed in a museum, where a salesman came across it. He was sure he could sell it, and it saved the company in the 1930s. I guess management not recognizing what the people want has been a common theme not only in this day and age.
Color plays a part in collectability. Pink is the rarest, so it tends to run more. Blue is also highly sought after. Since this pattern is easily recognized, you might not be able to find a bargain. If you do come across a piece at a garage sale that it reasonably priced, grab it. Even if you don't want it someone else will. Also, it still works great for home decor, and is very unique.
This sample is from PrissyAntiques on Etsy and according to the listing is in great condition. I just love the blue color. Wouldn't it look nice on a dresser with flowers in it?