The sensing functions I am still working, I must figure out how and where to put the sensor inside the frame,ultrasonic etc. and also i need programming, which i must figure out,how can i do :)
I already make wifi version as well with Particle Photon and with Android app to control the NeoPxels over internet. That let you change all the LED`s colors individually without programming. IFTTT also working with this Spark Pixels app and also with the Particle photon it self see more on https://community.particle.io/
You can "paint" mix the colors it will be fixed non moving, you can adjust the brightness on any moving mode the speed to.
Acrylic and pigment Painting on acrylic glass,of course need some practicing and playing with the colors, but if you like to painting.. well I am lucky because Eva teach me.
The photo foam board need,because protecting the painting about scratch,and also reflecting the light.