you can change the leaf icon by replacing the fa-leaf (and the fa-seedlings if you were looking to change that too) with anything from fontawesome.com!  toyhouse allows the pro versions as well :]c

<i class="fas fa-leaf fa-2x mx-4"></i>

for example, if you wanted a pixel alien, you can use fa-alien-8bit!

<i class="fas fa-alien-8bit fa-2x mx-4"></i>