One of the most common problems, if you want to call it a problem, that most individuals have though is deciding on, or at least finding the right theme to use for their particular site. There are literally thousands, if not tens of thousands of free themes available, and a huge list of "premium" and custom themes to be had.
I've found that the most popular free themes are so commonly used that you wind up having your site looking like many others, and most people strive to be unique. The answer is to have a custom theme designed, but that can get expensive rather quickly.
Although you can have a WordPress theme designed specially for your site(s), there is often bug-fixes and tweaks to be made down the road that continuously adds to the cost. If you have several sites, as many WordPress users do, you may want each site to be unique, so the costs are then multiplied.
Most end users probably don't have the expertize to code their own themes, so it becomes a matter of paying for the custom themes, paying for a premium theme, which may also be on thousands of other sites, or going with one of the common free themes.
It should also be noted, that although most theme designers are honest individuals that are merely looking to get their work known, and a backlink from every installed theme, free themes have also been known to occasionally have malicious code embedded.
If you're not a programmer, but would like the option of designing your own custom themes, there is another way. There's a program called Artisteer that is gaining wide popularity in it's power, ease of use and reasonable cost. For a fraction of what you might expect to pay for a custom designed theme, you can purchase the quality Artisteer software.
