I bred my Pastel YB to a Het Red female this year. They copulated about 6 times, but it doesn't look like the female is going to go. I guess I have to wait until next year to try again.
I think any new combo is worthwhile. You never know how it will turn out. Sometimes they aren't that great and sometimes they are real gems. Even if the combo by itself is not that great, they may be awesome when something else is added to the mix.
I just picked up a Pastel Ivory so I maybe able to do the cross next year. As of yet I don't know of anyone who has done it but that doesn't mean it hasn't been done.
I will be pairing my Butter Het Cajun with a Yellow Belly or two. It is a combo that might be less subtle with the Y.B. in the mix. Amir's pics will be great to get a general idea.