I tend to take a lot of pictures of patterns - sometimes inadvertently, sometimes on purpose. And when I say 'Abstract' in this sense it's not to such a degree that the actual subject is illegible, just not the main focus of the photo if you're looking at it a certain way.
Picture Descriptions:
Door Rivets (Rabat, Morocco)
Wooden Chairs (Sharon Temple, Ontario)
Cafe Tables (Salamanca, Spain)