I am trying to replace my default ficons but when I do, you can still see the default color button in the background.
Here's a screenshot of what I am talking about.
Did you replace the offlock image?
I used that picture as an example. I replaced all of them, on, off, and offlock. It still leaves that dark button in the background.
What about clearing your cache and rechecking the directory?
This is how I save my ficon:
This is how it shows up on the forum:
your forum's forumbit_depth2_forum template has <div class="icon_back"> at the top.
change it to <div class="myficon"> to remove the background color for the icon.