If you have access to a 3D printer, you can download the files below and print the custom umbrella holder. I would print with a translucent filament (I used a clear PETG filament). You will then want to solder longer wires to the NeoPixel strip wires so you can install the strip in the walls of the print.

I used a chopstick to get the wire through the little hole at the bottom and to slide the NeoPixel strip into place, then just pressure fit the top on. That's it! Not the fanciest design, but it works quite well.

Plug your Sparkle Motion back in, and the next time it rains, your umbrella stand should light up blue!