Zach, via FTP, go into here and pull a copy of this .png :
yoursite.com/public_html/modules/jrChat-release-1.1.0/img/icons_black/chat-open.png
(-notice its size is 64x64 pixels, and it's background layer is transparent)
Create your own new .png, 64x64 px, and transparent background if desired. Call it chat-open.png and replace the default png with your own, via FTP. (save a copy of the default one in same folder there though, and maybe re-name it "orig_chat-open.png" just in case you need to revert back to it at some point.) Using the same name for your new png is good because if it's called up by code anywhere, it'll now just automatically show your new png wherever called up...just as though it were the original png.
Edit- I just realized that using this method you'd have to do the same replacement each time you updated to a new chat version folder (currently 1.1.0, but eventually a new folder for 1.1.1, etc). This is simple enough to do each time there is a jrChat update...updates tend to slow down after the initial flurry of a new module.
I realize it'd be more elegant to change the codes to always point to your uniquely-named icon INSTEAD of to ,chat-open.png .... but that's beyond my ability and my crude method might just get the job done for you in the meantime. L O L Maybe someone else can tell you how to get it accomplished more permanently.
--
...just another satisfied Jamroom customer.
Migrated from Ning to Jamroom June 2015
updated by @strumelia: 01/28/17 10:51:50AM