Even though it isn't frequently necessary down here in the Houston area to plug a truck in on cold nights, I have used the engine block heater several times. The most use it saw was several years ago when I used it every night for a week while goose hunting up in the Texas Panhandle. Nightly temps dropped into the mid-teens to low 20s at night, and having the block heater sure made a difference on startup and getting the heat blowing in the cab.
Anyway, after installing the front end replacement, there really wasn't a good place to attach the block heater plug. I ended up just feeding it up through the gap betwen the bumper and the driver's headlight and zip tied it to the grill guard. Here's a "before" picture:
Well, I wish I could take credit for the idea, but I found this idea on this site. Since I don't have a boat, the idea never occurred to me, but basically I bought a shore power or battery charging receptacle, cut a hole in the bumper (no easy task, by the way, with the tools I've got), cut the plug off the stock cord and wired it up. It definitely has a cleaner appearance. Check it out:
Although I hate to admit it, I did have a whoopsie when wiring it up. I installed the plug after the cold weather season and didn't get to test it out until the following winter. The problem: one green wire for ground, and two black wires. Which black wire to which post? Well, my first guess wasn't good. I plugged the truck in one night and went out the next morning to find the truck wasn't warm like it should've been. So I had to swap the wires on the post. After that, everything was great, and the plug and heater work like a champ.