Might wish to try some small plastic clips. They are like clothespins but not as strong of a spring. You can buy them on-line through adult toy stores or go to Wal-Mart and get the bright plastic ones.

Great idea, Sir W.

In the U.S., Walmart and 99 cents stores are a treasure trove of naughty fun. My Walmart has this special on clips for chip bags - less than 3 dollars gets you all sizes and assortments to try out. Some jagged and small, some bigger and some with magnets. (build in weights)

The 99 cents stores are a great place to find wooden clothespins. I like these because they are not as harsh as unyeilding plastic.

Whether your subbies nipples are large or small, you can always trap a bit of areola in the clip for that extra special feeling - and to help have more support for the toys you select.

If you haven't read the breast punishment primer on darker pleasures, it's a great place to start your research and get some hot ideas!

http://www.darkerpleasures.com/primer/

Play safe and have fun - you'll want to enjoy those breasts for years to come (and cum).