Not much of a throwback, but possibly last years TOTS dybala?
A good throwback idea is Abedi Pele for Marseille and Voller for Bayer Leverkrusen though they would be too high
That is already in
Here are a few:
Karl-Heinz Rummenigge
Didi
Just Fontaine
Dixie Dean
Falcao (Brazil)
Gerson
Kenny Dalglish
Tom Finney
Here is a squad of ideas
http://www.futhead.com/16/squads/8910994/
Some more ideas:
http://www.futhead.com/16/squads/8967502/
I packed De La Fuente yesterday and realised that players like him and Deyna are probably my favourite Throwback cards, it would be cool to have more old-school players that were true legends but aren't as well known as others. For example Josef Bican (Slavia Prague), Lev Yashin (Dinamo Moscow) and Jimmy Johnstone (Celtic).
Also a Jamie Vardy Fleetwood Town card would be awesome!