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On a transparent layer make a perfectly round selection (hold down
Pick the gradient tool. Make sure you have the default black to white gradient. From here you can do one of two things. You can simply swap the foreground and background colors, or you can just check the "Reverse" box in the gradient tool dialogue.
In the Gradient dialogue, set the gradient type to radial.
Now drag a gradient starting about 1/4 to 1/3 of the way into your circular selection. You should get this. (I purposely did this one kinda large so you can see it better.) Keep your selection active. The second image shows a large and a small rivet. For most purposes, you will want to do a smaller on. I am not gonna give you a specific size...These brushes are easy to make and you can whip one up to suit your needs fairly quick.
This step is optional, but, if you put a new transparent layer BEHIND the rivet and grow your selection by 1-2 pixels, then bucket fill with black, you get a more defined rivet. I like to take this a step further and blur this layer by about 5-7 pixels. Merge the rivet layer and the shadow layer. To get the whole brush, with the shadow, do Layer>Transparency>Alpha to Selection, and grow the selection by enough pixels to get the rivet and the shadow, plus a little more.
Now, do Script-Fu>Selection>Selection to Brush. Fill out the boxes in the dialogue that comes up, make sure the default spacing is set how you want it, and click okay. The script will do its thing, and your new brush will pop up in the brush selection window.
Start clicking rivets.
If you need nice orderly rivets, use guides to position them. I suggest also doing your rivets on their own layer, that way you can experiment with colorizing them to make brass or gold or bronze rivets with Layer>Colors>Colorize.
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