Park them at Sedo.

If they have any traffic, they'll make you money.

I have hundreds of domains sat over at Sedo each making me a few bucks every day, thats $ that i wouldnt have gotten for the domains otherwise, after a few months, if you have good traffic levels, you should be able to at least break even on the cost of the domain registration.

The added benefit of parking them at Sedo is that if you decide in a month or two you actually do want to sell them, you will at least be able to show the buyer a 'past history' of traffic levels and, more importantly, earnings.

Regards,

Lee