Another vote for the publications by The Lance and Longbow Society (especially 'Standards, Badges & Livery Colours of the Wars of the Roses') http://www.lanceandlongbow.com/ If you want a realistic order of battle, the Poleaxed sourcebooks from LALS are very good too, and easily converted to oth...

You could get the Osprey 'Wars of the Roses' volume. That includes a number of liveries. If you want more detail, I would strongly recommend the publications by the Lance and Longbow Society for this: http://lanceandlongbow.com/ 'Standards, Badges & Livery Colours of the Wars of the Roses' gives...