You can still get the old customize page:

http://www.tumblr.com/customize-classic
http://www.tumblr.com/customize-classic
http://www.tumblr.com/customize-classic

Fuck yeah Tumblr.

Little boxes on the hillside,
Little boxes made of ticky tacky
Little boxes on the hillside,
Little boxes all the same,
There’s a green one and a pink one
And a blue one and a yellow one
And they’re all made out of ticky tacky
And they all look just the same.