Ah zephiel87 you got there before me. I'd been trying out different hexagonally-tessellating patterns such as these tiny 'T' shapes:
(terrible art I know, it was just an experiment)
But your blob pattern works much nicer. I guess the pixels have to be roughly square or round for them to be useful.
Based on this, you could reduce the size of your blobs even more and get the same pattern:
I think having the hixels touching diagonally and vertically works better than diagonally and horizontally (like ptoing's original pattern), if only because it makes isometric stuff much easier. I'll have to try doing some iso work on this 2x2 hixel grid...