The default colour scheme of WLM is the "Windows Live" colour(as mentioned, top left of colourize drop down).
However, this will still turn you images a blueish colour. If you want your images to stay the colour you made them and not be colourized, you have to set the Metadata for colorization to false, for example:
code:
<Picture Id="">
<File>bleh.png</File>
<Metadata>
<Colorization>false</Colorization>
</Metadata>
</Picture>
This will make the images you have created always look as you intend.