Can I use translucent silicon to create an iPhone case?

I want to give my friend a unique phone case for her birthday and most phone cases seem to be made of silicon. Is it realistic for me to build a nice-looking usable phone case that resembles a person out of silicon in two weeks?

Do you have any experience working with silicone? I know they make it look easy to use on Face Off but it takes practice. What you will need to do is make a mold of a phone like your friend's ( make sure it is a broken one) the mold making process is quite messy and labor intensive.

I did find a quick and dirty Do It Yourself video for a silicone phone case there's audio expect relaxation music.

I found silicone mold and casting video. There are specific products listed but it has some good sounding tips and tricks.