Using a Bluetooth Feather and a diffused NeoPixel strip, build a lightbox to aid in writing and tracing.
BleBox LightBox 2 - LED RGBW Bluetooth driver - Botland - Robotic Shop
Overview Make it Glow: NeoPixel and LED Diffusion Tips & Tricks
The Circuit, Bluetooth Controlled NeoPixel Lightbox
You love NeoPixels, and you love silicone diffusion? It looks a lot like neon, but without the need for expensive transformers, glass tubing, inert gasses, or a Las Vegas casino license.
adafruit-NeoPixel RGB Neon-like LED Flex Strip with Silicone Tube
ROM Bootloader WiFi-Controlled NeoPixel Matrix LED Sign
Overview, Bluetooth Controlled NeoPixel Lightbox
Overview, Adafruit CAN Pal
How To Control WS2812B Individually Addressable LEDs using Arduino
DARKPROOF LED Pixel Light WiFi Bluetooth IR Remote
You're looking at the world's smallest Bluetooth LED controller. LightBox RGBW Bluetooth Controller v4 is a wireless smartphone LED controller using
LightBox RGBW Bluetooth Controller v4
Overview, PyLeap BLE Controlled NeoPixels with CLUE