change the position of google search bar in Google Now Launcher
If you're into rooting and Xposed Framework, this module called Xposed GEL Settings has a bunch of Now Launcher-related settings, among which you can disable the permanent search bar. You can then put a search bar widget on arbitrary location of the screen.

Note that this app requires a compatible version of Now Launcher / Google App to work at all. Supported versions are listed on the module description page.