For a current project, I wanted to use the Shapes point symbol library but was frustrated by the limited color options. I took the 6 symbols and made versions of each in these additional color options: Brown, Dark Blue, Dark Green, Gray, Magenta, and a brighter yellow.

Of course, to use them, you'll need to copy these PNG files to someplace publicly accessible and then specify the URL to the symbol under the Use an Image option:
