Here's one I made myself. Pretty much the same as the ones you guys made. A slight variation I thought was worth posting.
Here's all the parts I used.
Here it is assembled.
You could easily put six bulbs on a standard power strip. I personally am not using this setup because I have some HIDs and will only be using CFLs for the first two weeks of vegging, but thought some CFL users might like it. I recommend using zip ties to secure the fixtures to the power strip.