Definitely cute :-) Although there are a number of things this could be, I'd like to suggest genus Galerina, given the size colouring location and the helmettish cap shape. cheers, frog
I think this is the same species as the first photo, but not as old. Both found on the trail to Opal Lake, in very southern Colorado. These don't seem to match either of the Galerina spp. in "Mushrooms of Colorado and the Southern Rocky Mountains". Spore print shows medium brown color, not rusty (ie I don't see any red in the brown)
