User blog comment:LurkerLordB/Celtic Union Flags/@comment-1630894-20120601231444

The Gaelic flags are easy since they are simple. Scotland is just a white cross on a blue field, Man is just the triskelion on red, the Irish is either the harp on green or the red cross on white, so they are easy to combine. It's the Brythonic ones that have dragons and ermines and black and white symbols which can't be put on top of each other easily.