Using layers. The noname image, for instance, could be created with a circle or ellipse right over on the edge of your image. Decide if you want to do drop shadows to each layer or only to the complete image.
Same applies to the rectangular shapes too. Then when everything is lined up as you like, you crop to the required size - just be careful if you have shadows that they don't get cropped out too.
Keep a copy of the image with all the layers intact so that they can be changed individually if you need to... and do a merged copy of the image to flatten it all. You could use Paint Shop Pro - Adobe Elements or Gimp to get all these effects.