I have just had a quick go of this.. i will post the original and the duotone versions.
This was taken a whil ago and is not in the time frame and will be just for practice.
Is this what you're after?
Original..
kids on bikes by
Evertonian1878, on Flickr
Duotone..
kids-on-bikes-duotone by
Evertonian1878, on Flickr