I can't think of any. With some themeing though, it should be with most of them. I am pretty sure Beautiful Widgets has a metamorph out there that may do this. There are a couple text based themes out there, I am pretty sure I saw one of them theme BW.
Maybe if you ask in a thread with the theme nicely someone will make a few .pngs if they don't already exist. I wouldn't imagine you would be the only one wanting this, especially for BW since that app is rather popular. The stock power widget should also be able to be themed too if you preferred that.