XBlog has not been officially updated for Sitecore 8, but you can download it from https://marketplace.sitecore.net/Modules/XBlog.aspx?sc_lang=en and follow Brad Christie’s comments for using it with Sitecore 8.
Of note if you use IE, the presentation details for the creator are not there by default – you’ll need to copy them using Sitecore rocks (it blows up in content editor since it is in the core database).
Item in question – /sitecore/client/Applications/Launchpad/PageSettings/Buttons/Marketing/XBlog
In Rocks –
Right click – tasks – design layout – Firefox – click on the little square button at the top left to copy into IE.