creating jpg images from main image to Blank item image

Title : creating jpg images from main image to Blank image We are into print merchandize images.. mainly for mobile phone covers and cases. Example : if we over 1000 kind of design and these all design we want to offer for iphone 5s, iphoneG, iphone 5C, iphone4 , samsung s3 , S4 .. and list goes on. all these mobile phone have difference in sizes and position for backside [ such as camera position, buttons, and side buttons and size etc ] while selling on line we need to show each design fitted into respective brand model so We are looking a script where they can create the all images into blank. more detail ........ in back end we will provide all 1000 images + a required model blank image. if needed We can also provide the configuration where the image should be resize automatically or customize than after script should create the all 1000 images into the required blank size please refer few examples of one design but they are create manually .. now same we want to eb done with one click of mouse.