So long as it's a pleasant sour, I'd consider it a pleasant suprise. But I happen to enjoy sour brews, so this sentiment may not apply to you.
There are a few things you can do: sit on them and see if they develop into something you may enjoy...the sour may "mellow;" find someone in a local club or in your region that likes sour beers and make a swap; or, as jkmarvin says, you could blend it...I'd seek out the advice of someone with high blending skills. Gordon Strong comes to mind as a qualified resource...besides being someone who would not hesitate to share his knowledge.
But of course that's why you posted here...because someone is bound to have relavant advice.
Most of all I'm happy to see that you are not considering dumping the whole batch...
Wosrt case scenario: find a sour head and give it to him/her.