Shikano, here is a typical round bur tool for rusticating. They come in various sizes and of course the size of bur determines the pattern given.
There are many tools that fit the Dremel that are suitable for rusticating, each giving a different pattern as can be seen with
Ejames' efforts. I have heard of some folks using a broken drill bit for rusticating!
One other tip I would offer is to buy the Dremel keyless chuck, then you can do away with the various size collets required for certain tools. Also changing tools is that much quicker with a keyless chuck.
Ejames, the pattern I was most impressed with was the one on the white stemmed pipe. Those 'knife' burs look like they would do the trick so I will hasten to Amazon to seek them out, many thanks for mentioning them.
Regards,
Jay.