Creating curved channels (1/16" deep & 1/4" wide) in/on a curved surface

Although this may not be applicable to develop 3d elements on curves, but some suggested videos and articles for projecting textures and images onto curved surfaces include:

http://help.sketchup.com/en/article/3000114

and conversely to project a curve onto a flat surface:

If you are looking to place 3d objects on curves, you may want to explore the follow me tool or the Profile Builder 2 plugin.

(Always enjoyed the “What me worry? guy, Alfred E. Newman” btw.)