1st Row is rather basic - LHS the Irish Harp, RHS the St Patrick Cross 
2nd Row is first version of showing Wales - adding in a green base
3rd Row is second version of showing Wales by replacing the ring of fleurdelys with a ring of ostrich feathers and a rough coronet
 Yes the proper historical cross not the red saltire made up for the Order
It's always struck me that one of the noticeable things in AH is a distinct lack of boring tricolour flags. This is kind of a subset of the thing I like to raise about how AH flags are often 'unrealistically good' compared to OTL flags, which are often dashed off on the back of a fag packet by people in the middle of a battle who don't know the rules of vexillology. OTL has already given us many, many boring tricolour flags, both horizontal and vertical, but there are still plenty of colour combinations that haven't been explored (or perhaps only explored in obscure examples). Here's a few - feel free to recolour the image if you have ideas of your own. What might these be?
I think the top ones are from a world where Fallout is all 1970s aesthetics rather than 50s and some post-apocalyptic society has made a flag out of the only materials to hand, namely shag pile carpets.