Here is my version of the a gel holder. The concept wasn't mine, I saw it on the web somewhere, probably on strobist. Total cost for me was 80 cent, might be more for some who don't have the necessary tools...but hey, this is an excuse to go out and get them...you can never have enough tools. 
I picked up a plastic picture frame holder from Walmart for 80 cents. They have two sizes that will work. For the larger flashes, the 3.5x5 is good and for the smaller (yongnuo) flashes, the 3.25x2.25 I think would work better. The bigger size is 80 cents and the smaller size is 50 cents. So I bought a couple of each in in case I messed up and for my multiple flashes.
Here are the frames I purchased as well at the Rosco Gel displayed in my gel holder.
EDIT: I made a version of the smaller one also and I think the smaller frame would work better for most purposes. Check down the thread for picture of the smaller version.
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Here is what you will need:
Frame
Marker
Plastic Scoring Tool
Ruler or Straight Edge of some sort
Heat Gun or a lighter/candle will work as some have successfully used also.
Measure the size of your flash head against the frame and mark place with marker
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Place the ruler down and start scoring the plastic. This takes some patience but after a few minutes, you will be able to just snap the plastic in two. Its good to score more than halfway through first.
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Once you have snapped off the first piece, you will need to measure for the second cut. From the first cut I measured about 1.5 inches towards the base of the frame. This will be the part that attaches to the top of the flash. Once you measured, do the same as before and score the plastic till you can break it in half.
You should have this now.
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Next you will need to take the heat gun (or lighter/candle) and melt the plastic. I put on gloves as to not burn my fingers....it can get pretty hot and it helps with holding the hot plastic easier. Also use a ruler or a straight edge to help bend the plastic straight. I found it easier to heat the plastic on the opposite side of where the cut is, then flip it back around a use a ruler to bend it.
You will know the plastic is hot enough to bend with it starts to droop a little. Don't not hold the heat gun in one spot, keep waving it back and forth until the plastic is hot enough. This is so the plastic doesn't curdle.
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You should end up with something like this.
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Now just use some velcro to attach it to your flash or a rubber band and your set.
If you use a Lumiquest Softbox III like me, just pick up the smaller size so the holder doesn't overhang on the edge.
Hope this helps you. Good Luck!
