I have three good drakes - one blue trout and two penciled runners.
At this point I have a few eggs of her with a blue trout drake. That will start me having a group of trout runners (with some blue trouts thrown in) as soon as I get my incubator in the mail. Not sure if I'm interested in breeding for Saxony, but that would remain an option. I'd also like to try breeding her with a penciled runner drake to get the brown gene in there for gold trout. I could simply breed out the runner markings to get gold (brown) trout.
On the other hand... I could mix the trout with the runner markings (either in brown or in regular trout color). This might take a few generations, but would presumably yield a duck with great head stripes paired with lots of runner white. This would, presumably, create a very striking non-standard duck. On the drake side of that same design, the M+ gene combined with the penciled runner genes would presumably give a penciled runner with a chestnut/burgundy colored chest fading into the regular brown before reaching the white band on the belly. This would be a colorful drake with fully white under-wing (mallard as opposed to dusky). That would again be non-standard but might be really pretty. So I would have new colors of runner ducks - pied trout and/or gold pied trout. Just a dream at this point, but we'll see.