ok i had better put up some proof that i feel this is possible. to begin with you must look at the gold of the following birds being easilly replaced with silver. both these birds are ER and i have test mated them just in case i got it wrong. the following is ER pekin crosss hen being used to make laced pekins like a sebright, based on ER:
i feel with a bit of selective breeding the hen could become a columbian style bird.
next is an australian game ckl. i have had birds with more red on the breast than this one and very convincing wing triangles:
hope this works first time as the gallery has changed a little.
if you want to waste some time looking at photos: http://www.flickr.com/photos/54516384@N02/
or set my BYP gallery on 45 photos per page for loads of chook photos and more.