Those are nice rims on your ride. I have a neighbor who has, I should bite my tongue, an Acura. That rice-mobile has nice rims and he does keep his car clean. I'm not sure they'd look good on a CTS though. What looks good on one model isn't necessarily suited for another.
I personally think the rims have huge gaps making the rims look weak and flimsy for a CTS. Since the CTS is a bulky, mean mechine I think that the rims should also look thicker as well. Its like when you see a body builder with scrawny legs. Just my opinion. Cheers.