If it is ridiculously tiny (better if you measure in millimeters or something rather than lego bricks) then it is possibly a microdot, a very small version of a pill.
LSD is not found in microdots quite as often as on blotter or in liquid form, but sure exists... but in pills of regular size it would be extremely unusual.
Still, we have no idea to see if there is LSD in your microdot or not - you would have to use a reagent test on it to get a not so conclusive answer or lab test for a reasonably conclusive answer.
The different colors are likely due to the binders and fillers etc used to make them being different colors, but again: nobody could tell you about cuts, identity or purity. That has nothing to do with it. It could just as easily be cut when uniform in color or pure when having blotches and spots.