As cool as that orange RSS icon looks, it won’t necessarily fit-in with your blog’s design. It’s orange! Sure, you could just use a different color, but why not get a little creative? You don’t have to use the same style as everyone else. You can make it a different shape, use different gradient styles, or something completely different.
If you do decide to customize your icon a bit, be sure to keep the same symbol on it. The “antenna” depicted on the “standard” icon means “this is an RSS icon!” If you leave it out, people won’t necessarily notice that the button is for an RSS feed.
Here’s a little inspiration: