I love how they showed how the known universe seems to clump up as filaments at scales of up to about 100 megaparsecs, or on the order of about a billion trillion miles.
http://www.roe.ac.uk/~jap/2df/2df_slice_blue_big.gif
At larger scales the structure of the universe has been observed to be uniform in every direction though, so you can model it like an ever expanding bubble, or say a balloon being blown up. I'm surprised that hasn't been brought up yet.