Looking for a nifty keychain? Just yank the any of the SIMMS or DIMMS from the computer you are about to throw out and add an keyring and your done!
Step 1: Find Materials
The older the machine the more parts you will be able to extract from it as the memory modules were smaller and more numerous than they are today.
Step 2: Attach Keychain
Of course, you will have to get over the fact that the RAM you just made into a keychain was on the magnitude of 50 or 80$ per MB back then and now worth next to fractions of a penny.
This particular one is a single 256kbb SIMM from a 386 before it went the computer went to the eWaste facility.