It's a beautiful thing when you can combine different interests. Reader TurbineBlade combined biking and fishing with this great hack. Another fishing rod holder hack from the past can be found here. If you have combined passions, let us know so we can feature.
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This isn't actually an original idea, but rather one that I've stolen and adapted slightly for my purposes. Essentially all I've done is cut sections of 1 1/2" pvc and attached them to a rear rack using hose clamps. Then I cut a large notch in each section to accomodate the reel. I use a hand held landing net that also fits into one of the pvc sections, secured by a velcro strap. Easy and works great!