Image Customization in Silverlight

Question

I need to implement an image customizer in silverlight.... I have already made an image editor which can upload ,crop,resize,rotation,save images on server as well as local , but this is a little different where i need to ...sort of paste the image that i have uploaded on one of the base images... We can upload images on the canvas by ImageBrush as well as fill images in various shapes such as ellipse on mouse click events. But in this , we have to paste the image according to the object , like for example if the mobile cover has a camera hole , then we need to leave that space and stick the image in the remaining solid areas..... How do i do this in silverlight... i'm unable to figure that out... Please help !!