I'm fiddling around with my Arduino and TLC5940, and I'm getting a headache from staring at them. But, I don't want to sand them down, or otherwise permanently diffuse them, and putting them behind a sheet of paper or typical diffuser won't let me clearly see the specific patterns I'm trying to achieve.
Step 1: Straws to the rescue!
What you need:
Straws (Normal, cheap ones. Bendy-style optional)
LEDs you want to diffuse.