I've put out another version [0.4.1] that includes themes. The 't' key 
binding allows to cycle through them. The themes are easy to extent: 
Four pictures 32x32 (player, box, wall, and goal) and an initialization 
step to introduce them.

Best,
Robert

Robert Hirschfeld wrote:
> There are two updated versions of Sokoban available from SqueakMap at 
> http://map1.squeakfoundation.org/sm/package/1e5bb5b3-0114-4888-be6e-095d82205e6c. 
> 
> 
> While the functionality of both versions is the same, their 
> implementation differ: [0.2.4] is more structured, [0.3.4] looks simpler.
> 
> Enjoy,
> Robert
> 
> 
>