I guess that is why I like the block exchanges here. They are not really that specific, just the general color guidelines. I have not been disapointed yet. If it was a situation like this, where the receivers got input on what colors they wanted, and I couldn't oblige I would not join. I wouldn't ask for an apology if someone didn't like my block, but I also wouldn't answer with an apology for them been poor. Just my opinion. I would just explain it didn't work in this project and invite them to watch for it in one of my next projects.