Being a new fly fisherman and a very new fly tier I have what I am sure will be an easy question for you old pros

I have the book Fly Tying Made Clear and Simple by Skip Morris and have tied 2 of the Rick's Caddis on a size 12 hook using his recipe a few turns of #1 lead, bright green dubbing for the abdomen, and brown dubbing for the thorax. ( I must say for my first attempts they came out fairly nice)

My question is this. It is stated in the recipe that this fly can be tied in other color combinations and I was wondering if any one could give me some different combinations.

Thanks and tight lines