How do I set an existing product's option as a special, is this possible?

For Example..
If I have say a generic tshirt product at £10, and it has 3 options...
ie...
Generic tshirt
|
|---Red
|---Green
|---Blue
Each option is a tshirt of that colour at £10
But say I wanted to put just the blue tshirt option on special at £6, when I say special I mean so that it appears in the specials module on the front page, with the red discounted price, so that customers know that it's an obvious promotion.
I don't want to create a whole new product, ie a blue tshirt, and then put that on special. I'd just like the blue option, of my existing tshirt product to appear on the front page as a special. And then perhaps when a customer clicks it, it goes to the generic tshirt product with the blue option selected. Can anyone advise on an extension which would allow this? Or a possible workaround which gives a similar result?
This is to avoid having to create duplicate products when it is only a certain type/option of an item that is on offer.
Grateful thanks for any help offered!