I usually google something like "user account page css" or something.

Depending on what I'm looking for I'll also search  http://codepen.io/ which has some really awesome (and sometimes useful!) stuff.

I've been looking for something dashboardy for you but it's hard to know what words to use, as a dashboard and a user account dashboard are two different things. It might be worth using a dashboard type theme like this: http://codepen.io/icebob/pen/DbfgK (or even this: http://codepen.io/MyXoToD/pen/hLzGs )and massaging it into what you want to do.

David