Just thought I'd stop in a quick share a block I made for last month's Ringo Pie bee:
Like Kerry said, these blocks are deceivingly simple looking. It was fun though, I got to try paper piecing. I had only done paper piecing once with a string block via Film in the Fridge (just a bit simpler than the union jack, but a really good one to start with and get the hang of how it all works).
If you're interesting in trying out this block a similar template and set of instructions is available here.