You've probably seen studded phone cases somewhere on the internet before. They pop up on tumblr every now and then; and then there are the people that try to sell them on etsy for $80. Well before you grab your wallet, have a read of C'est Classiques great and simple tutorial!
I followed it down to a T, ordering the same spikes from the same website and everything. $20 and some toothpick stabbing action later, here's my very own completed case!
I wasn't mathematical about the neatness of the stud placement whatsoever, but I can unscrew the studs any time and realign them if the messiness ever bothers me ;)