Here is the code I used to make the heart shape
code:
<Image Integration="subtract">
<Source>
<File>heart_region.png</File>
</Source>
<Position>
<Left>1</Left>
<Top>1</Top>
<Width Unit="percent">100</Width>
<Height Unit="percent">100</Height>
</Position>
</Image>
You will also need to pad it out in one of the definition files in which I don't know how to do so I haven't managed to finish the skin yet until I find out how to pad it out properly
edit: the image i used had a white heart with a black background as i have used the work "subtract" it will remove any black area in the picturs but leave the white there