Foreveryoung Diamond Painting Zigzag Rulers – 9 PCS Diamond Art Tools and Accessories for Beginners, Fits Square Kits for Adults, Keeps Drills Aligned

I use these. They work VERY well for color blocking, but honestly, they work well for confetti too! Sorry for the Amazon link, but they’re forever young zigzag rulers. https://a.co/d/080HNtUX