I'd like to do the two Norwegian ones.
I'd like to take the LBC across and drive up one side of Norawy to Nordkapp then back down through Finland and the Baltic countries, Central Europe, northern Italy and southern France all the way to Gibraltar.
Europe- North to South, basically.
I reckon it'd take about a month and a half, and a good GPS system, and a wife in a much more tolerant/forgiving/do-the-heck-whatever-you-want mode than she's ever been in...
First, I'd plan on softening her up with a drive around the ring road... for the whole country of Iceland....