Is it possible without jailbreak?Did someone try it?  

Yes it's possible, just save the custom that you want and then go to the era image upload. Then press choose file and it will send you to your pictures, after that just pick custom and you're done!  

Posted by John

Yes it's possible, just save the custom that you want and then go to the era image upload. Then press choose file and it will send you to your pictures, after that just pick custom and you're done!

If everything was that easy...there are 2 main problems 1) iDevices' files have jpg format only and jpg format is unacceptable,you need a png format.

2)it won't work on a normal browser like safari,it will work on puffin though or alwaysonpc.

I did some research today and found 3 awesome apps that can help you to convert jpg into png in order to upload the customs successfully

1)image file converter(by Chad Hine)

2)JPEG<->Png~image file format converter~(by handyCloset inc. WARNING:THIS IS AN IPHONE APP)

3)http://www.online-convert.com this site is just awesome

Now you just need puffin web browser which is actually amazing and is very cheap,just open it and upload the custom via puffin web browser.I did not really upload the customs yet but I got no messages about size problems or format problems,the only problem was a fake email and nothing else.  

You could also jailbreak and download Safari Upload Enabler.