You are a genius if you spotted all the sleeves in the Mad4it! flier montage.
There are 28 and they are :-

The Beatles - Revolver
Blondie - Atomic
Blur - There's No Other Way
Clash - The Cost Of Living EP
David Bowie - The Rise & Fall Of Ziggy Stardust
The Doors - The Doors
Elvis Presley - Jailhouse Rock
Gwen Stefani - Love, Angel, Music, Baby
Happy Mondays - Step On
Iggy Pop & The Stooges - The Stooges
The Jam - Eton Rifles
Kaiser Chiefs - Employment
Killers - Hot Fuss
The Knack - My Sharona
Oasis - Cigarettes & Alcohol
Pink Floyd - Dark Side Of The Moon
Radiohead - Just
Ramones - Swallow My Pride
Red Hot Chilli Peppers - By The Way
Rolling Stones - England's Newest Hit Makers
Sex Pistols - God Save The Queen
Smiths -This Charming Man
Stone Roses - Fool's Gold
T.Rex - Children Of The Revolution
U2 - New Year's Day
Undertones - Teenage Kicks
White Stripes - Get Behind Me Satan
The Who - Tommy