Just to give a nice tip on pimping your activities:
You like to have other colours of your activity icons?
Just add some classes to your templates custom.css f.e.
Code:
.blackiconcolor {color:black;}
.greeniconcolor {color:green;}
.rediconcolor {color:red;}
Then just add this class to your css class of your desired action icon that it reads f.e. like this
Code:
fa fa-arrow-circle-up greeniconcolor
After that you see in FRONTEND your new coloured icon to select.
Have fun.