Put a Feather M0 receiver attached to some NeoPixels in all your various projects. The controller box will send a short radio signal (usually one letter, like "A") through the air, and your receiver will listen and obey.
For this example, I've got a NeoPixel crown, an LED Tutu, two Raver Bandoliers and a set of LED Isis Wings, each containing one Feather receiver. I've chosen to upload the same code to all the receivers, so when I press the "red" button on the controller, the command "A" is sent and everything turns red.
It doesn't have to be this way! I could easily upload slightly different code to each receiver, so that the "A" command causes my crown to turn red, my tutu gold and each bandolier could be a blue/purple gradient. It takes a little digging in the code, but it's not too hard to do.
Have fun making everything glow according to your every whim!