I just got this idea, ok, so here it is!:
Reply to this post with simple mods that you know of, just to help the beginner modders get a foothold on how to mod.
For the beginner modders; download this decompiler, it'll let you see into the mods' code, giving you a perfect example of how to code a mod.
Current mod list:
FYI most mods keep their code on GitHub and anyone can view it, which will be much easier to do than decompiling every mod you want to look at. But a list of good example mods is still a good idea.