Sprite Stitch Board!

I recently took to making perler bead flag keychains. These were made with Hetalia fans in mind but could also be patriotic. While many nation's flags are easy to figure out, some are more complicated. I was able to find a small pattern for the American flag but I need help with UK, Canada, China and Japan. I don't need all the details but I need to be at least close in size to the others.

Here's America: