Hiya,
The slices are just for customising the look of your transparent bliss template and need to be uploaded to your site manually.
First you need to install the transparent bliss template found here:
joomlabear.com/Details/Transparent-Bliss-2.html
NOTE there are two downloads and the second download is the template.
After you have installed the template you can use FTP to upload one of the preset slice collections in the customisation kit to the transparent bliss template /images directory overwriting the existing slices.
This will give you the new look and feel.