Overlays for Android lets you float widgets and controls as you please on your home screen

There's a sidebar feature that lets you swipe the left or right side of the screen to reveal a sidebar and toggle profiles. Application shows your profiles only inside a specific application. Events triggers profiles on event occurrence - for example, your music player widget gets automatically floated when you plug in your earphones. Currently, eight events are supported, and they happen to be Incoming and Outgoing calls, Wi-Fi on/off, Bluetooth state, Device docked, Headset plugged, USB Connected, and Airplane mode. And you might as well set a Global profile to float everywhere with the Always On feature.

These profiles contain overlays, and overlays stands for "everything that floats". You might not be able to eat everything that floats, but you can totally have your widgets, shortcuts, and in-app unique overlays (such as battery, weather, clock, missed calls, and unread messages) show up on the right place at the right time. If you long-press any overlay, you can enter "edit mode", where you'll be able to move, delete, re-size, and configure it - giving different settings, sizes, and positions for each overlay per screen orientation (portrait & landscape). Whew! That took some explaining!

Overlays is free to use, and if you're happy with it, you can pay for Overlays Pro ($1.99) and its additional features.