How about Lido Green Poly (an original '52 color)? Or if you want to go into the blue family, try Belmont Blue, another original color for the 1952 Plymouth.
I had two Belmont Blue Cranbrooks and still regret not buying a beautiful Lido Green one years ago.
There are color chips for all makes/models posted at:
www.autocolorlibrary.com
UPDATE: I just went to the link above and the color resolution on the '52 Plymouth colors isn't all that good.
Here's a link to an eBay auction for a Cranbrook that's 'almost' Belmont Blue.
http://cgi.ebay.com/ebaymotors/1952-Plymouth-Cranbrook-Blue_W0QQcmdZViewItemQQ_trkparmsZ39Q3a1Q7c66Q3a2Q7c65Q3a13Q7c240Q3a1318QQ_trksidZp3286Q2ec0Q2em14QQhashZitem260272698001QQitemZ260272698001
This car was originally Belmont Blue and was repainted by Maaco to the closest color they had at the time (mid-1980's). I know that because it used to be my car, and I sold it nearly 20 years ago!