inner workings of the digital photo keyring

[photokeyring]

Hi, i'm new to the forum and have been trawling through the raft of info : )

i run a small blog on digital photo keyrings and was wondering if any of you guys can point me to any general info on what components a typical digital photo keyring is made from?
i'm looking to collate as much relevant material as i can before i construct a post for my vistors to hopefully inform/educate them in the creation of the miniature electronic wonders