For the shadow and background i used photoshop! You have to select the sim on the picture with the Rapid Selection tool, press ctrl c and then ctrl+v and it will copy the selected image on a new layer. After that, you use the rubber/eraser tool (i don’t now its name in english, my PS is in italian) on the initial image - the background level -choosing the color of your preference, and you’ll have the colored background. For the shadow, you double click on the level, it will open a window named Level Style, at the bottom you have the drop shadow/external shade option, and there you can fix th shadow as you want.