Open image and duplicate and name it "sketch".
Enhance: Unsharp Mask, you can play with this but I added quite a bit of sharpness, more than you would want for a normal photo.
Filter: stylize: glowing edges
again play here try something like 5,13,14
Go to the Sketch layer and invert colors with / control,shift,u
Enhance; adj. color and ;remove color
Create an adjustment layer over on your layers column and tweek levels and brighten .
Below the sketch layer you will now add a white layer, if it does not come out white then Press alt and back space. Double click and name "white".
Go back to sketch layer and put it as an overlay
Go back to white layer and select the eraser tool and a brush like a dry media brush #63 set about 15-25% and begin to erase the white away to reveal the image underneath.
DO NOT FLATTEN YET.
There that is the process I used for the Zebras.
For this next step for the sunflower Batik effect I used a copy of the original background without any thing done to it except using levels to brighten. In the Layers use a watercolor (lowest settings)
Now take this layer and drag or drop it under your layer named "sketch". It should take on a life of its own now. You may not like it, or it might be fantastic. Keep playing with different images and experiment till it pleases you. You can use blending modes such as multiply and linear burn, overlay or what ever you want for this till you find something you like, and then change opacity to suit the colors you want.