For the TYW, it's fairly easy to get details on the Swedish flags, and many different ones are commercially available.
For the Imperialists . . . not so much.
Does anybody have a good source (web or dead tree) that will list standards used by the Armies of Wallanstein and Tilly? I'm specifically interested in the 1630-1632 period, and right now my major interest would be the neu-Piccolomini and Gotz Cuirassiers, or anybody from Wallenstein's left wing.