The blue bulbs will get you in trouble if you have them in your turn signals, well depending on how bright they are. I had blues in both of my turn signals and got pulled over. So just be careful about doing that. All you have to do in order to make them all blue is just buy blue led bulbs (194 and 3057 i believe) And you will be set there.
As for the paint, I would wait until it is all there and then paint it all at once. But don't put the kit on and the spoiler and just drive it around like that for month's on end until you get enough saved for paint. Wait to put it on once you have the money ready for paint. IMO nothing worse then seeing people with body kits unpainted driving around on the streets. But that is just my 2 cents worth.
Have fun modding your ho, and to each his own, don't forget that.
