Red torches, inverted bedrock crosses, and messages like "DIE" appearing on signs.
If you truly want a version before any block interaction existed, some modders have created fan-made “Pre-Pre-Classic” builds. These are not official but satisfy the curiosity. Download Minecraft Alpha 0.0 0
Minecraft Alpha 0.0.0 is not an official historical release of the game; instead, it is a popular Minecraft Creepypasta Red torches, inverted bedrock crosses, and messages like