What in the world is growing in my garden?

What in the world is growing in my garden?

What is this?! It seems to start off as a yellowy-brownish color and turn white the next day. There are about 8 patches like this in the garden.
What is that?! It certainly doesn't look healthy! Thanks to anyone who can help identify it! ETA: Thanks everyone! I'm glad to find out it's harmless. I swear, my cats will eat just about anything! ;)
Raising Existing Beds

Raising Existing Beds

These guys make the whole block green with envy.

These guys make the whole block green with envy.

cherry tree

cherry tree

Question about my roses and pics!

Question about my roses and pics!

flies

flies

My new place!

My new place!