I'm on the first aero mod... I made sure to make it cheap and removable so I can do testing to determine its influence on my FE when I have a dependable daily commute.
I used sheetrock corner-brace, some recycled coroplast campaign signs, sheet metal screws, washers, and duct tape. Paint will come later.
As for the poll, I'm trying to decide... paint the skirts white and put the ecomodder.com decals on them (to make the decals stand out), or green to match the car?
More details than you'd ever want to know about what I did are on my blog, along with more pictures.
Matt