White leather case and pogo pins battery case
I now have both of the above, both cost around £9 -£12, and both serve different purposes.
The white leather case is good in that it protects the screen, it keeps the phone low profile (ie it still feels thin even with the case on) and it protects the camera lens by raising the lip slightly. It also props the phone up at an angle for watching films etc.
Downside is that it can feel a bit awkward when making calls because of the leather cover and also when using the camera. Not too bad though in reality.
The battery case on the other hand does bulk up the phone a bit, so it feels larger (bit like a galaxy note) but actually does still look good (IMO). So far it does also seem to work. Not tested it extensively, but people reckon it will charge your phone back up by 40%. If I was going to have a long day I would switch to this case. The kickstand is a bit flimsy and so will probably not use it much, but it does click into place so it stays out of the way and does not flop around.
Anyway, pics attached so you can make up your own minds. I have put a Duracell AA battery in shot for size comparisons.
HTC One X (Vodafone UK) - ARHD 18.2 Stock kernel.
HTC Desire Z (Vodafone UK) - Donated to the father-in-law to play Words with Friends
Touch Pro 2 (Vodafone UK) - ROM: Psychosis (Home baked using OsKitchen)-now sent to mazuma mobile....
O2 XDA Serra - Home Cooked ROM- now sent to mazuma mobile....
O2 XDA Stellar - KaiserChef creation based on Mbarvian's Solace ROMs - now Deceased
Orange M3100 - now just gathering dust.....