I am working on the First Maryland, CSA, and realized that I needed the state color for this regiment. I am new to Photoshop but I took a crack at repairing a photo of the flag so I could use it:
The repairs aren't perfect but should be fine for 25mm - especially after I 'animate' the flag. Some of the gold leaf I did not repair as I figured that campaigning and battle would have flaked off quite a bit of that.