[Elecraft] color codes for SMD capacitors

[gwwhatley at juno.com]

I have several SMD capacitors and have no idea how to identify them.  Each one is in a very tiny package, which seems to be color coded, but no clue as to what the colors mean..
I have pink, yellow, green and blue packages.  The capacitors themselves all look alike, with no markings on them.  Do the colors mean anything?
Any help would be appreciated.  
 
George, N4YM