wow, those are small. cute I bet though. maybe look at some photos of small log cabins online to see quilting designs done on them. that might help you decide. regular stitching, feed dogs up (engaged) always. doing free motion usually they are down. although i took a free motion class and the instructor had us leave them up. worked fine.
try drawing your log cabins on paper and then a design and see how it looks to you. good luck.