Edit: It seems I haven't worded this question very well.
I drag a monster or NPC onto the map from the compendium. By default, it comes with a token that is all set up with the necessary associations, hit points, ac, darkvision if applicable, etc. etc. But I don't want the default image. I want to slap a different image into the same token without having to rebuild all those associations every time. I hope this clarifies the question.
Is there an easy way to swap a token IMAGE only, while keeping the token's associations, stats, etc.? I don't want to have to reset all that stuff every time I save it as a default token for that NPC/Monster, and I don't like the wrong perspective on the default tokens that come with the compendium monsters.