I use image editors because I have to, rather than having any particular skill in that area, so anything to help with my efforts are very welcome.

There is plenty of help to be found courtesy of techZilo, with a collection of brushes for GIMP. A brush is a shape used to paint with. Most image editors come with a variety of circles and squares, which is of no help to my feeble efforts.

The brushes included here are all kinds of shapes and sizes, hopefully good enough for me to include in some webgraphics.

There's even some useful help on adding brushes to GIMP. I'll come clean and admit that I needed to click the link as I've never done this before. It's very easy. Uncompress the files in the zip to the brushes folder (this can be found in the GIMP preferences) and either refresh the brushes or restart GIMP. I had to do the later but it's hardly a problem.

If you've not tried The GIMP, it's very powerful and completely free.