Is pixels free to use?

I'm curious to understand the intricacies surrounding the usage of pixels, specifically in the context of digital art, design, and potentially cryptocurrency. Could you elaborate on whether pixels are indeed free to use? Are there any legal or ethical considerations one should be aware of before utilizing pixels for personal or commercial projects? I'm also interested in knowing if there are any licenses or permissions required when utilizing pixels in innovative ways, such as in the creation of non-fungible tokens (NFTs) or digital collectibles. Clarifying these points would help me navigate the digital landscape with greater confidence.