Small command line utility that cycles through all subwebs in a site collection and reappllies the currently selected theme. This is useful if you have a lot of subsites and you've made a change to the theme.
How it works:
It cycles through all the subwebs and for each it applies the default theme and then again applies the previously selected theme. If you just apply the same theme again, no change happens.
1. Download to the server running Windows SharePoint Services
2. Open download folder in command prompt
3. run retheme http://sitecollectionurl