Form follows function.
None of the weapons I own are considered beautiful - USP40, M590, M590A1, AR-15. They are very utilitarian in looks but their functionality cannot be questioned. Hell, right now I'm finishing up the AR and getting ready to move into Glock territory.
I'm not James Bond, so a "pretty gun" really has no place in my locker. If anything, I prefer the rugged, practical looks of the aforementioned weapons over race guns and engraved shotguns.
Not to say that I don't appreciate a beautiful weapon, especially one with a rich history behind it. They are just not to my personal tastes.
The most I have done in the looks department is to make sure that my AR has matching furniture if possible - stock, grip, foregrip, and rail panels in FDE. But even then there is a function behind it. Why buy components in a myriad of colors when I can get them in one color for the same price that actually suits my environment?