There's a whole lot more designs on Google. PM if you want me to whip some up for you.
I have been googling, but most of the designs I find are 'hanging banners', like the swan design above, not flag/pennant designs that can be attached to a spear/lance/pike.
I may take you up on the offer, and see if you have more luck than me, but not right now, as I am still building the Perry plastic spearmen I am going to use as Dol Amroth men-at-arms.