I am aware of the stripping technique, but is there another way to get 2 colors at one time out of a icing bag? Not sure this makes sense or not, but I am going to do a top boarder and want it to look like smoke...1/2 white/1/2 gray, and I am not sure how to do it. I know they make double bags, but I don't have time to get one of those...any creative ideas out there in how to do it? Not sure I want to attempt the stripping concept. Any advise would be helpful. 
take two disposable bags, fill one white and one grey but not real full.
put both in bag big enough to hold both.
option a: empty the simlutaneously in to big bag and then away you go
option b: leave them in big bag and twist all three together closed and then pipe away.
I did a Marine cake in my photos like that with red/white/blue. I could not get all 3 colors in individual bags to fit into a larger clean bag, so I squirted them all in one bag one at a time. It came out pretty even.
Wow, NEWTODECORATING, that did come out even for three colors in one bag! Amazing. The Marine cake is outstanding!
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