Puzzling Times

Since the very first post on this site, up to (but not including) this one, I have sprinkled a hidden message throughout. In order to find the message, you must pay attention to "RGB" values.

Lest anyone be excluded, the puzzle is simple enough that all who can observe colors should be able to verify it. The trouble is in finding it, of course.

Anyone who discovers the message should know how to claim their prize. Just explain, in your own words, how the puzzle works, so I know you are legitimate.

Some time in the future, I will put up a scoreboard, for this and any future puzzles. Of course, the first winner will get the best prize. Hopefully there will be more than one, though. If you do figure it out, I humbly request that you don't spoil it for others.

Have at it!

This candy wishes you good luck:

Two fused blue oblongs, with a chunk taken out of the nearest, facing you.

HnarRRRrugzt!
(that means "Good luck, human!")