You can resize the texture to 1024x1024, but it will then need to be reworked, because they look crappy. Here is an example with a late 3rd Pz div emblem as an example:
I haven't gotten very far with this, as you can see. The 1024 images are, well, big and take a lot of time (which I don't have now)
Now if someone like MikeyD would do some of these, that would rock.