Hi,
As an CS/SwEng undergraduate studying OS development in my spare time, I feel I'm qualified to give you a few pointers.
There appears to be conflicting aims in your question:
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...looking for project ideas in OS development
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and easily implementable
Nothing in this field is easy, least of all "new, experimental" things. The field of OS development is probably one of the hardest you will ever come across.
There are some things that match your "new, experimental" requirement - managed operating systems like Singularity and Cosmos seem to have a lot of good, new ideas behind them. If you have a mathematical background, you could look into real-time operating systems - there are algorithms for schedulability, complexity and meeting deadlines that are being actively developed; again though you could probably not find a more difficult sector.
Remember though, if you're only doing a Bachelor's degree, you don't need anything that's new. You don't need to push the boundaries of global knowledge, like you do with a Masters or PhD. All you have to do is show competence in project planning, management and evaluation.
If you're doing a Masters, well, I would still advise you to stay away. There's not much you can do in a one year course unless you already know a hell of a lot about the area, and by the mere fact that you're asking this question I can infer that you don't.
There aren't many research topics in general purpose OSes at the moment, which is why my Masters is actually going to be on compilers and parallelism. Loads of new ideas there, perhaps you could check that out instead?
Failing that, if you could get back to us with some thoughts about your prior experience that would help. Quite honestly, most undergrads would not be up to research in this sector.
Cheers,
James