I actually agree with ratchet, (hear hear!) some colours wouldn't hurt. I know you've said that most of this stuff are just placeholders, and you really should focus on finishing the coding first, but even your old superku project was a little bit on the brown side, if you know what I mean. Don't be afraid to make it colourful. Use a bright palette, using colors also makes important objects (like switches, mechanisms and such) stand out more if you pull it off right.

Just my two cents though.