This is an easy method to add mood to your images.
Duplicate Background Layer
Filter > Blur > Gaussian Blur – I used 100-130 on these images but it depends on the look you want, so have fun experimenting
Then change your blending mode on the Layers palette to Multiply. You may want to reduce opacity on the top layer.
This can work on scenes too.
Light colored subjects can give a nice, ethereal impression.