Your description sounds like a double four patch with sashing. Is this it?

Here is a link that might be useful: double four patch

I think I am the one who mentioned the name Calypso and I, too, was amazed when I Googled that name and came up with several patterns and again none that resembled the one I was thinking of. It seems to me that designers of fabric lines use traditional patterns but give their own names to their creations . Even in quilt magazines, the quilts use patterns, which for the most part are traditional, but they have been given different names, so it is quite hard to know what its original name might have been.
Good luck with your search, And FYI, the Calypso I was referring to was a pattern by Ro Gregg, using her line of fabrics.
Theresa

Wow, that's close! Thank you. I went through a lot of 4P patterns but didn't come up with that one.

Granny T's Square Dancers pattern: Take the double four patch block (unsashed) and alternate with a sashed square that has patches at each corner. Layout alternates the sashed square with the double 4-patch, giving a diagonal design to the finished top. This is a great pattern for scrappy quilts since there are actually only three pieces in the pattern and the size is very easy to change. Granny T mostly used 2" squares, 4" squares and 2x4 rectangles. For DD, I'm using 1 1/2" squares (4-P and sash corners); 1 1/2 x 3" rectangles (sash); and 3" squares, all in azure, blue and white fabrics. To make it easier to balance the colors, I do suggest using different fabrics for each size piece: that is, don't turn extra rectangles or large squares into 4P.