changing colors

I need to know if it is possible to take a full color photo and change it to shades of one color. Say a full color photo of a man in a car on the road and change it to all shades of one color say ...browns. Not a brown toned shades of gray but one with different shades of brown representing the shades of gray. Think like the final product will be used to do a neddlepoint picture and yarn must be bought to do the picture. Is it possible and what is the procedure?...Thanks in advance

Desaturate your color image (Cntl+Shift+U)
Image>Adjustments>Hue Saturation
check the colorize box, then slide the bars around for the effect you want.