well heres my first post and to photobus.
i have been thinking the same stuff as you and have a few humble offerings.
If you have photoshop and can drag your image onto a blank canvas either black or white and add a stroke around the image (not the canvas)....this can do a lot to really set off your image as far as appealing to the viewer.
Obviously it is very subjective re colours and sizes and stroke colours.
When presenting the images the border and stroke which are printed with the image now, simulate the cardboard edge stuff that a framer would use mounting the image in a frame.
I have found this very effective.
To see what I mean visit my galleries
http://www.pbase.com/blindpoet
and if you want to know more. Contact me.
All the galleries have examples of the technique BUT the pad is fastest. I tend to present my images for pbase the same as I intend to when I get around to tryn to sell some at markets etc
A well presented image sells itself.
I also have looked into adhesives etc for mouting.
So I may hear form you.
BlindPoet (NZ)