I am going to answer this question based on both my and hundreds of my personal students' experience. As you have asked about specifically beginner projects, let's look at just a few of the ones covered in the Beginner DVD set.
The "All Wire Unisex Bangle" is a dependable good seller in the mid-price range of $50 to $85. My "Orbit" earrings and any type of headpin charm earrings are a customer's favorite impulse buy, both for personal as well as gift use, and they are low end items priced between $18 and $35. Framed cabochon pendants are a constant as they are usually one-of-a-kind items, made using different colored stones and embellishments, mid to high end priced from $30 to $145 (or more). The "Anything" pendant sells well at a lower end of $15 to $30. Lastly, the three-bead and "Orbit" rings sell for $10 to $25 and are another very popular impulse purchase. Wow! That's quite a versatile collection for a beginner, and all of these sell well!
The "mystery and intrigue" you are looking for can come by simply using a variety of unique beads, stones and materials within these designs, adding a chain here or a charm there. Although the art form of wire jewelry has become extremely popular in the past few years, there are still a lot of folks who have no idea how to do it, and even more folks who would rather purchase a finished item than learn to make it themselves.
Answer contributed by Dale "Cougar" Armstrong