Just two things that might be fun for a simple update.

[akume...@yahoo.com]

I recommend parks and water.  Now, nothing fancy here, just flat expanses of blue and green with maybe a few representational objects spawning in the park blocks.  However it would make a pretty cool little addition to the game without, hopefully, too much work.  And maybe the parks and water enhance probability of certain sizes being possible?  Your focus in these early stages should be on game mechanics so aesthetics can certainly take a back seat.

[Synekism]

Probably won't make it by next release but I'll try for next next.