The lovely Lis at La Mia Cucina let me know about an all retro food blog called Jam Handy! Even without the retro recipes, I'd love it simply because its blogger, Kirkkitsch, quotes Murry Head's "One Night In Bangkok." (Best. Song. Ever.) AND he has a cupcake favicon.
So if you're still looking for RRC # 3 recipes, take a look at Jam Handy! and see if you can't dig something up.
Retro Recipe Challenge # 3 rules and resources can be found here.