I'm going to try and play around with it when I get home later tonight. I don't know if I have any past candid shots that would fit the cinematic look, but I'll take a look. I tried to dl the free version of Mogrify, but it didn't work for some reason...I probably installed it wrong and I kind of just forgot about that plug-in...I can add borders my ghetto way, by using MS Paint, which I've done for fun. I just do a background at 16:9 and then add the photo at 2.35:1 ratio.
I haven't gotten into using layers, and have never used Mogrify, but I know there are plenty people here who have gotten good use for it, so I'd say you should be able to come up with a pretty simple solution there!
As far as using Paint for the border, sure thing it would be a simple process! Easy to create a new black background canvas with the proper dimensions and paste the image into into it and move to position it properly and bang! You're there! Really, for this, it would be just as simple as using Photoshop to do it!
I find the Lightroom HSL tools are very useful and powerful for working with color channels. If you've never checked them out then do that without further ado! Each of the toolsets, Hue, Saturation and Luminance, could play a part in all this and, if you look, you not only have control of eight different color channels, but also a "targeting" tool for choosing one tone in the image that you can mess with.
Well, if you want to work with layers but don't have/can't get CS, then your choices are maybe Photoshop Elements, which is very inexpensive (<$100), or the free Gimp, which has a lot of things but requires a lot of plug-ins and can be a bit cumbersome to learn and get a handle on things...
But I'd say if you can score Perfect Layers legitimately then give it a try! I did download the Beta, but for my workflow it just didn't meet my needs. I do have a working copy of CS3, though, so it's there for when I need it. In fact just yesterday I used it for my focus-stacking project! I don't know if Perfect Layers would work as well for that type of thing but the Beta period ran out and I'm not going to shell out more $$ for software I don't need!