What do I mean by this?
Here's what it means. If you want to quickly change some colors or fonts, you'll go to the Layout --> Fonts and Colors page like the one on top. This is the easiest way to customize your own template if you don't know how to play around with the code.
But sometimes the things you can change are limited. For example, if you use the basic templates provided by Blogger, you have only about 10 - 20 items to customize. Other free templates also provided a limited number of things to change from, at most probably about 40 items.
But when using the templates provided here at Ourblogtemplates.com, you can change around 70 - 100 items, depending on the templates you use. That's way a lot more than the rest. This option is great if you got easily bored looking at the same templates, or if you want something a little bit different with your own taste.
If some of the items you want to customize don't change if you choose different colors or fonts, don't worry because those items might have been left there from a previously designed templates and are not meant for the templates you're using. The rest of the customizable items will work just fine.
If you're still not sure what I mean by all this, just try using one template designed here on a test blog that you can easily create (don't try on your main blog yet if you're not sure). You'll see how easy it is to customize the template.