-----------------------Sneezey
Piszchek---Mertesacker---Koscielny---Gibbs
----------Wilshere---Martinez---Ramsey
-----------------------Özil
--------------Vela----------Balotelli
Have the CM closest to the FB provide help for him defensively instead of the winger as we do now. The midfield 3 to minimize space between themselves and the back 4. Use the dynamism of Ramsey to join in attack. Fullbacks, one at a time, to provide width in attacks. When Walcott is properly back he takes Vela's spot.
A positive with this formation is that Podolski can play as a striker, because he will have a partner, and Giroud can play with either Vela, Walcott, and at a stretch Podolski. Always have a target man, always have a mobile player with pace up front.
If we can't get Martinez, then get Schneiderlin instead.