Photos can be saved from an email by holding your finger on the photo, then choosing Save Image.
Regarding the setting of resizing your background image, it may be desirable to enable 'Reduce Motion.'
If I could simple hold photo down an a SAVE IMAGE. Poped up with the other. Air drop RUBBISH ...... WHY WOULD I ASK HOW TODO IT WITHTHENEW IOS7 here's am answer for you guys COME ONNNNNNN...........ITSNOT WORKING WITH iso7 all I get is a stupid airdrop with mail icon DO U THINK ID WASTE YOUR TIMEIF ALL I HAD TO DO WAS PUSH AND HOKD PHOTO DOWN .....?