Detroit Lions
Lions silver helmets (Cardinals in white) from a 1947 Football Illustrated.
Layne's 1954 Bowman card
1954 Bowman card
Bobby Layne 1954 Time cover
Jim Ricca's 1955 card
Layne's 1955 card
Is this a pic of the Lions?
Blue helmet from 1955
From 1954
From 1957
1958 Topps card
1958 Topps card
Circa 1959/1960
Game worn, reconditioned by Hemethut
Alex Karras gracing the cover of a 1970 issue of SI. This variation with both the white center stripe and plain Lion logo without the white outline only lasted from 1969-1970 (I think). 
Billy Sims from 1980
The 1994 Special Throwback
Current version from the 1984 Media Guide
My kitten Benny. Wishful thinking!