Brown pollen? Could be bird cherry or another Prunus. The bird cherry here is in full flower and the plums are out too - may be the source of the brown pollen my bees are bringing in.
Blue? Possibly Scilla sibirica, spring squill.
White? Do you have any butterbur in your area? It might still be in flower. There may be other possibilities.
Your brood box sounds quite busy. Seven full frames of sealed brood will make about 14 frames of bees, so I think that you did the right thing. OK, the coming cold weather might delay them using the new frames, but they will be short of space very soon.
G.
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