Here are two ideas inspired by Mario's excellent Smalltalk emulation:
Wouldn't it be fun if Self+emulator could be X3J20 complient? That is, compatible with the future ANSI Smalltalk standard. That would get some attention. I haven't look into it (I don't have a copy of the draft) and so don't know how hard it would be to do this.
I do know that the standard doesn't say anything about GUI programming. Having recently tried various Smalltalks (Smalltalk/X, Dolphin Smalltalk, Smalltalk MT) and looked at the documentation for others I have to say that I much prefer Self's morphic UI. Here is my idea: wouldn't it be neat if someone ported Kansas to Smalltalk (GNU Smalltalk, for example, which doesn't have any built-in GUI)? I know there are several fancy window builders for Smalltalk, but this would be really a great alternative.