I would imagine you could, but it seems like it would get pretty messy. Plus the size might hinder the ability to get delicate swirls. I used to use just a plain wire clothes hanger until I bought this tool a few years ago:
Hanger Swirl Tool. <p>Create beautiful swirls in cold process soap with this hanger tool. You'll love how easy it is to use.<br /><br />The Hanger Swirl Tool is made locally here in Bellingham, WA.<br /></p>
So much easier to work with/bend and well worth the money.