Here's two examples using the leading tone triad to *tonic note, appoggiatura style.
e:-----------------
b:----------15-*13-
g:-------16--------
d:----15-----------
a:-14--------------
e:-----------------
sweep-----|
e:----------15-*13-
b:-------15--------
g:----15-----------
d:-14--------------
a:-----------------
e:-----------------
sweep-----|
Here's another one I like for preparing for the dominant chord in a minor scale.
e:-13-----------------*15-
b:---11-------------12----
g:-----13---------14------
d:-------12-----12--------
a:---------11/12----------
e:------------------------
sweep-------------|
* dominant root
"My whole life is a dark room...ONE BIG DARK ROOM" - a.f.i.