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Could you describe these in a little more detail? The first photo is the better of the two but the colors are WAY off on my monitor (your hand looks purple!)
I'm guessing some species of Lepiota from the shape of the cap and the umbo ("bump") in the middle. L. lutea is one of the most common greenhouse & houseplant species, but those are lemon-yellow in color. Many related species probably like similar habitats.
Of course you have enough sense not to eat these, but I will mention anyway that several small species in the genus Lepiota contain dangerous poisons. Pretty little mushrooms, just enjoy looking at them!