Hi,
I wrote a little script that allows you to insert a small image in a bigger one, like this example:
Supernova SN 2011iv (http://astrosurf.com/astronosur/galeria/SN2011iv_20111207_1.htm)
The settings are simple: you select the images (big and small), location, margins, and optionally a border width and border color. Here a UI screen capture:
(http://astrosurf.com/astronosur/pixinsight/img/ImageInsertScript-1.png)
I am almost certain that there must be a more efficient way of doing that which I have used, but still it was fun. I used the classic way of crop and PixelMath (like the manual way), with a little math.
Enjoy ;)
Enzo.