All I want for Christmas.... 40 phone etchings

Dear Santa,

I know we've been pretty demanding of late, and with 39 more gifts still to go, it's only going to get worse. So, you can sort out this one for nothing, nadda, zip, zero.

The O2 store on Oxford Street is offering free tattoos. On phones, unsurprisingly. They've got experts in store til 23rd December, who will either engrave one of their designs, or one you've come up with (although presumably not 'I love Vodafone'). So, please feel free to borrow my phone, sort out some pimping, and return it within an hour. Thanks.