Was it the worst open rate, or worst click through rate? A low open rate is usually from a bad title, and if that's the case, Constant Contact has a new feature on new templates where you can test subject lines and send one version with one title and one with another. If it's a good open rate, and you just did not get many sales, maybe the whole thing just needs to be a little sexier. I find that pale yellow does not really excite people for call-to-action buttons and you have to be careful with pale campaigns. People get advertisements all the time, so yours really has to stand out. You also wasted good headline space as you already have your tagline in your logo. There also may be too many words. Some of our most successful campaigns were super short and simple, i.e., one beautiful picture and one good headline with a few sentences, then "Buy" or "Shop" on the button -- that's all. Look up quotes/sayings on color for ideas as I think the customers need a simple underlying message, for instance, "Hey these things change colors and that's cool!" So maybe try something like, "Why settle for one color when you can have two?" Good luck and your is quite and interesting company!
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