James, mind if I ramble?
I just finished up an art festival and will now be doing a LARGER art festival in September (it's juried and has about 300 artists/vendors). I will tell you what I did.
My situation may be a bit different than yours. My goal was to mainly get my portraits out there to drum up more business; HOWEVER, I also wanted to make a little money on the side, so I also sold some nature/landscape work.
Is this an outside event? Get a "pavillion" pop up type of thing. Now you need walls. Because mine was a last minute situation, I bought some plastic small opening lattice. I don't recommend it unless you are stuck in a situation like me, last minute. Now I have a company (I have to look up the business card I have on file) where I can buy these things specifically made to be walls for this type of things - that is what I am going to invest in in the new show. They will be black and will show off my work way better than this lattice did... but the lattice was a start (got a lot of compliments for some reason, I thought it looked like hell...)
Now, on to the nature/landscape "stock" work. I only showed about 14 framed pieces like that on one small "wall". I also got a canvas holder (they are fairly inexpensive) and put copies of just the print in there. The prints were packaged with a piece of acid free board behind them and I got clear plastic sleeves that closed up with a strip of sticky on the back from clearbags.com.
I'm with you, though, I'm currently stocking up on more stock images to sell in September, and I am trying to find out what people like. I personally like "deep" black and whites of lone trees, and things that move, but at the same, people gravitate toward "cutesy" for their homes... I know, it sucks, but they do. Things like a flower photographed three times at different angles and placed on a white canvas is a big hit... I have a peacock cropped pretty cool that someone with a red kitchen would want in a second... and things like herbs in pots photographed, barn scenes, etc. etc. are big hits. I print two or three of each image and put them together in the canvas holder so people can thumb through them.
Here's some images that can show you what was going on for this one... I hope this helps give a visual for you - festivals/shows are a lot of fun, enjoy!!!
Here is a closeup of the portraits mounted on standout...
work, and also with the creeping lung-crud 
uke-rig: that's been going around, and with my car's engine deciding to start chewing up and spitting out serpentine belts :banghead: . This weekend, for almost certain, though, I'll be printing. I've got some negatives I want to look at, and my fixer should be fully dissolved.
You can certainly try it out but, given the time pressure, this may not be the best of circumstances to start toning experiments. Unless you wanted to do something quick & easy, like sepia. 
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