Reply To: Theming the Recent Replies Widget

To style the widget use this, I did it to mine and now is just a background with text and lines.
Title stripped, border stripped, ect.
Adjust it as needed.

#bbp_replies_widget-2 {width: 400px ! important; height: 500px ! important;  float:right;}
#bbp_replies_widget-2 .widget-title { display:none ! important }
#bbp_replies_widget-2 { border: none ! important; box-shadow: none ! important; background-color: #DDE8F4 ! important; }

It could be that yours has a different number #bbp_replies_widget-2, so maybe 1 or 3 or 4
You can find it in the Page Source of your forum or use Firebug
I use the ID instead of the class, incase of using the widget more then once. Then you can style them separate.