I have just about finished my first model, and was curious, after someone else mentioned something similar, who might be interested.
I have taken clear turn signal housings for the 1st gen turn signal in the front bumper and converted them to dual-purpose. When driving normally, with no driving lights on, turn signal operates as factory, flashing yellow. Turn on driving lights and the light is a bright white light that operates like a driving light. If you are driving at night (or in the day for that matter) and have the driving lights on, turning on the turn signal will turn off the driving light on that side, and start flashing yellow. I have yet to determine exact cost for this, as I am still figuring out if I want them to be plug-n-play with the driving light harness included, or if the purchaser would want to have their own driving light control.
Anyone interested in this type of a setup?