I was thinking about my product covers and how they all look the same, but they've got nice different color patterns... but honestly it has become more difficult to think of color combinations for them. Thanks to Pinterest and color swatches (in particular Design Seeds) I now have a pretty much limitless supply of color combinations. Here is a tutorial on what you can do to make your product covers POP!
Here are a few examples I played with:
The next two are based off of the same color swatch. I can see one being great for Valentine's Day products and the other for Christmas products!