Tom at NothingVentured.org says I have a big and beautiful RSS icon. How about you?
I’ve seen blogs that change the colour of their feed icon, crop it, and develop their own to try and stand out, but orange is the blogosphere’s recognised colour, so best not to confuse your readers by ‘hiding’ it with what you think is being clever. You want people to see it and subscribe, so make it obvious.
I run my RSS through Feedburner. Simple to set up, free, and there are some stats in there too.