Ugly! Ugly!!! No way. This is like Dob Modding (remember that grasshopper

). It gives your scope character. It gains you notice when you are out on the imaging field "Gee Mike that is a great idea. I'll use that on my setup". Ugly Pfft. It's all in the eye of the beholder.
But silver duck tape, now that is just chincy and crass. Black if fine, but silver....puhlease.