I've done a buff orp roo over a rir hen. The resulting offspring were a dark orange color. I named the one hen Nutmeg. No pics though, as that was quite a few years ago.
We've got a red Orp project on the go. Started with Buff Orp male on exhibition RIR females. We're on the third generation. Type is still a tad variable. The best being quite close to Orp type but not quite close enough. Colour not quite as dark as an exhibition rhodie but much darker than a new hampshire.
I hatched Buff eggs last year. I have one Roo that is the most beautiful gold/buff color and has black in his tail. I am inclined to thing she must have snuck into the RIR pen for a quickie, because this is the only chick to come out looking like this! He is beautiful, large! and very friendly. I have pictures of him...but I haven't read up on how to post to this site. If anyone is interested in him, I will be glad to give it a try or email it to you. He is up for grabs...I just have to cut down on Roos.....I'm not ready to start experimenting yet! Got too much to learn first.