I am currently working up to 6 months in an emergency fund, however, I just started to put a chunk of my paycheck towards a company stock purchase plan. I was just trying to max out my 401k and then save as much cash as possible, but now I am taking a portion of that cash savings and treating as a 6 month CD investment in the stock purchase plan.
If your employer offers anything like this, it is worth thinking about. I get a 15% discount on market price when the stock in purchased, and I can cash them out immediately. So I sign up for a percentage of my paycheck, and the funds are invested every 6 months. I plan on cashing them out immediately once purchased every month, which will give me an automatic 15% return. I will have to pay taxes on that return, but I think it's worth it.
This is certainly unconventional, but I can't find any other guaranteed rate that will rival this deal for a 15% return every 6 months. We will see how it goes over the next year, but I plan on adding that to my emergency fund, and using it to contribute to IRA accounts.