Could it be speckled butter beans? They have more color before cooking than Christmas limas, but not as big.

There are quite a few heirloom limas that are multi-colored, or have a mix of colors. "Rev. Taylor's" has various combinations of red, white, and black. The "Lynch Butterbean" is similar, based upon its description. The Hopi limas have a wide range of colors, but they are probably not the limas you are looking for.

You can find seed for the "Lynch" butterbean at the site below.

Here is a link that might be useful: Clemson University Foundation Seed Program

do some of these heirloom limas have various colors after the cooking -

thanks, mr toad