When I was learning photography, way back when, I did very little color work but one thing I remember doing, as an assignment from my professor, was to try "cross processing" my color negative. This is when you use the chemicals for color slide film development for regular color print film. The effect was a bit surreal but not unpleasing I remember. Luckily, Picasa provides a way to cross process your digital files quite easily. Yes, there is a way more complicated method, and probably a better way, to do it in Photoshop but I didn't have the time for that. (You can download a tutorial here if you want to give it a go.)
I tried the Picasa version on my work at Gethsemani and I really liked the effect. There's a softness, an almost ethereal quality to the image and it seemed to compliment the feeling of my time there. Compare the sycamore tree image from my earlier post to this "cross processed" version.
I'd never really thought about how the "processing" (Sorry, I still think of it that way!) of the file would effect the contemplative quality of the image but it is one of the "new ideas" I will bring back to Maine with me. Why don't you try exploring "new landscapes" with some of your old negatives...opps! I mean files! It could be quite enjoyable!