I've accumulated a few Glocks over the years. They are all completely stock, except for the addition of Glock Night Sights. I could post pictures, but they would look exactly like the first 100 results you would get if you Googled "Glock (insert model number)". I've customized a few of my revolvers and long guns, but I just couldn't get into customizing Glocks.
I used Glocks for work because of their anvil-like reliability and ability to take punishment. I never developed any more personal attachment to them than I would any other appliance or tool. They are excellent pistols, but customizing one of my Glocks would make about as much sense to me as customizing my toaster.