These are just amazing. Great work to inspire you.
50 Mind-blowing Retro-style Photoshop Illustrations - PSDTUTS:
"Graphic design from the 70s, 80s and 90s has plenty to offer modern-day designers. Here we introduce a bunch of modern-day graphic designers using the best of retro-styles to create incredible and original work that melds the past, the present, and sometimes, the future!"