Thanks everyone for your help and suggestions! And especially thanks to those who surfed through the Quilter's Cache website looking for it for me!
Just to clarify - I don't need the pattern to make this block, I have the instructions for it from my guild, and I've made 12 of them for the Blue & Yellow block swap. I just want to be able to put the name of the pattern on the blocks I send out for the swap :)
Farmer's Daughter that mytwopals found is definitely closest (it's the correct construction, just different colours and size), so I think I'm going to label it "Farmer's Daughter variation".
Jan