Lovely autumnn colors - really nice.
Very nice Cailean, well composed. I love those saturated fall colours.
Again - lovely! The autumn has to be the best time of year for photography in Canada!
I really wish I'd had a polarizer for that last one....
I've been working on a consistent method to create nice sepia-tone images... since I don't have a 'channel-mixer', I use the gamma levels 'un-linked' to vary the colour until it's resembles a sepia tone. In the process, I've gotten some interesting tinted images that are decidedly not sepia but still nice. This one for example, is a little on the orange side, as you said.
My basic procedure for orange/brown is to first convert the image to greyscale, then adjust the blue gamma to slightly below 1 (.80-ish). The other two colour go up, the red more than the green.
Once I decide on a tone that I like, I will use that gamma combo consistently so that my images are the same tone so I can frame them together, etc.
Don't change these to monochrome. The color is lovely. It reminds me of Kodachrome (as in the song).