Colour challenge: butterflies

Here are two photos of blue butterflies for the colour theme of the day, indigo-ish enough I hope. Both are males; the females of the species are not nearly as blue, or even blue at all.

The common blue (Polyommatus icarus):

The silver-studded blue (Plebejus argus):

Nice and blue, aren't they? From the side, these two species are not blue, but easier to tell apart; check for the little blue specks.

The common blue (Polyommatus icarus):

The silver-studded blue (Plebejus argus):

And another photo, because I can:

Thanks for watching!

^{All photos made by me.}