Try altering the gstatic
url. By experimenting with the url path you can fetch different icons with different settings.
The icons names are the same as those for Google's material icons which you can find at the link below:
Google Material Icons
For example, if you wanted to use the face icon, colored black, with dimensions 48x48 pixels you'd alter that url as follows:
https://www.gstatic.com/images/icons/material/system/1x/face_black_48dp.png
Which looks like:

Note: In the gstatic URL, the icon name is always in lower-case.
Some names may have multiple words. In those cases, use the underscore character(_) to join them in the url. So for the Face 2
icon, you'd do as follows:
https://www.gstatic.com/images/icons/material/system/1x/face_2_black_48dp.png
Which looks like:

Note that the numerical values in the URL are not arbitrary, for example there are a limited number of sizes you can set; 18, 24, 36, and 48. You can find more info about that at the link below:
https://developers.google.com/fonts/docs/material_icons
If you need the icon to be larger than the allowed values, you can change the 1x
to something else. So to double the size of the last image:
https://www.gstatic.com/images/icons/material/system/2x/face_2_black_48dp.png
Which looks like:
