The Icon of Hollow Grounds has been quite a problem in the past. It wasn't very crisp, it didn't stand out enough and Piri was barely recognizable in lower resolutions.
I've took the time with the Applifier Update (more on that later) and wanted to give it a new Icon here. In my opinion it is now where it is supposed to be. The only thing that could be argued is that it still doesn't reflect gameplay very nice yet... Thats a really tough thing to do in 57x57 pixels