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.
![](/legacyfs/online/485325_agol_shapes_additional_colors.jpg)
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:
![](/legacyfs/online/485324_agol_use_image_example.jpg)