I just single crocheted the case in black and then used a couple of tatting patterns as references for my string of clovers. I'm happy with it, though I may end up making another and another and another...there's nothing wrong with too many Phone cozies, right?
No

. You can make one for every purse. And if you don't have many purses it's a good excuse to make some, hehe!
Tatting looks interesting, I might have to try it if the results will be as beautiful as yours.