NextStart currently doesn't have those gizmos. You're probably seeing a screenshot which has NextStart as well as some other system meter app displayed that has a skin that matches the NextStart skin.
There are several different skinnable memory/ram/cpu apps out there. For instance, Sysmeter and Skinmem.
I think you can fine links to them in this app list: http://www.lotsofskins.com/index.php?page=resources
