adding color images to greyscale background
The background decides, and when you set to greyscale, you can't add colour as there is no place to store colour info in, in other words: no channels.
To get the effect you look for, you have to set your greyscale image to RGB mode. That way you have three copntainers/channels available. One for Red, one for Green and one for Blue. Because it is a grey imagen, these three channels will be identical (grey only means that the values of R, G and B are the same, ie: 128, 128, 128).
If you add a coloured image on a new layer unto this, it will be coloured.
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