A list of places to go when your looking for Sigils, House Banners, or Flags.
- Wow Tabard maker. Works well for smaller sigils and flags.
- The Fantasy Generator Website is another great place. 
- The HBO site has a house maker designer. Quite limited in scope but nice for major houses.
- Amazing theoretical version of making sigils. 
- Amazing Site http://www.ngw.nl/heraldrywiki/index.php?title=Heraldry_of_the_world
Request for original Sigils, and other types of flags can also be made quite easily on Devientart if you want to pay the real dollars for it.
- The Wiki site also has a lot of country coats of arms which can be adjusted to use as a houses of choice.
- John Jennetteart tumblr site has a ton of Game of Thrones House designs.
-  a roleplay website with a lot of heraldry.
- http://www.makeyourcoatofarms.com/get-started.asp free copy and paste
- Not a lot of icons available but effective flag maker.
- Need your own images, but if you have an icon then your in business. 
- Excellent maker. Costs money. 
- Sengoku Jidai Fandom