I am a huge fan of the Panini promotional packs. My first experience was the Father's day promotion, my second was at the National this summer and I decided to grab some this Black Friday as well. These packs always have some interesting "base sets" and are always loaded. Below is a sampling.
The Thanksgiving series features football players who played on turkey day. These are cool looking cards.
Rookies of Luck and RGIII - cards are numbered to 599 and look great.
These are proofs - similar to printing plates but not made of metal. They are blank backs and I have been told there are 5 for each color - these are clearly the yellow variety. The Namath looks pretty cool.
Another proof card (Doug Martin - yellow). The Woodson is numbered out of 5.