my little brother is in the same position as you. To impress his bosses he said he's trying to implement a "disaster recovery plan". whatever that means, lol
Ooh, bad idea. If the disaster recovery plan fails and data is lost, he'll get the blame for it and possibly get canned. It doesn't matter if it was a fault of the plan or not... Perception is reality.
Documentation projects don't work either. If you write well, you just end becoming the "documentation guy" on top of your existing work. It's a "promotion" with more work to do, but no extra pay unless you're an hourly contractor.
It would be better to volunteer for something like a server consolidation or virtualization project. Those save the company money... And bosses love that.
Volunteering for a new systems project is a good idea as well... But only if you think that the new system is better than the old one and has a chance of working. Otherwise, you get the blame for it Again when it doesn't, even if it isn't your fault.