I was looking at dom-repeaters with the template tag.  So i was going to walk an array.  I wanted to then walk the properties of the object itself.
I didnt see anything online though. I was thinking of something like
<template is="dom-repeat" items="{{data}}" as="row">
  <template is="dom-repeat" items="{{row}}" as="prop">
    <div>{{prop}}</div>
  </template>
</tempalate>
but the console throws one of those terrible stack traces about null not having the method "_badUpgrade". Maybe there is better documentation for 1.0 Polymer as to repeating over a dynamic object?
My end state is to create a datagrid allowing dynamic headers and dynamic data.... so the keys of the headers have to be a subset of the data properties so the correct items are assigned under the correct columns etc
