The Yahoo group ArtTechniquesDigital challenge this week was a progressive challenge where we had to start with an image of sunflowers, add an image containing lines, combine it in an interesting way using blend modes, filters or brushes. Then add an overlay of an aged texture and blend suitably. Then add another sunflower image – a smaller one if you used an initial large image or vice versa. Use exlusion or difference to blend this. Add another texture and finally add text if you want.
I read somewhere that it can be useful to rename each layer to include the blend mode used and opacity.