You can never have too many Gimp tutorials and you can never have too many Gimp brushes. So here is an easy gimp tutorial to help you create your own Gimp bubble brushes. Bubble brushes can help you create some great graphics, like this:

So lets get this tutorial bubbling.
Follow up:
Create a new canvas 375 pixels by 375 pixels square with a white background and a black foreground color.
Create a new transparent layer:

Use the elliptical selection tool to create a circle selection, for this tutorial I used a fixed size of 325 x 325 pixels:

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