Then maybe you could put a bit more work into them? Go look at Marcello and Snoozy27's boards. They have some damn shnazzy robots. Take note of them. Zappo also has some less complex, but neat robots.
LEss complex? Ouch, I say keep em simple. Then after a while add more to em, why add more to your plate then you can eat? I also think you should try out some stuff on paper first, and if you cant think of any thing draw some geometric shaped and start to add to them.
drawn in 20 min
But the question is why you like them so much or draw them so much?