SS 15Mar2004: In a tclcore ML thread about a better default Tk look&feel for Unix systems, Jeff Hobbs sent an interesting file with a style for Tk (see http://aspn.activestate.com/ASPN/Mail/Message/Tcl-core/2022026 ). Since Jeff states in the email that the code can be considered Tcl-licensed, it may be more comfortable for potential users to put it in some accessible place. For now you can download it from this link:
PT 15-Mar-2004: You can compare screenshots of tkchat with this style and a gtklook.tcl style here [L1 ]. I have committed a new version of tkchat that will try and use the as::style package if it can find it. The user can set a preference via then Preferences->Options dialog that will be used on the next re-start.