Abutting brick or paver stones to foundation
The only real concern here is that you don't want hardscaping sloping towards your existing foundation to the point where it's now directing water towards your footings.

So as long as you have proper slope, no real concern. 

If the patio is large enough, however, you likely do want to leave a slight gap between your pavers and the foundation to account for expansion during hot days. They make a product specifically for this for filling expansion gaps in slabs. It's just a thin (1/4" at most) foam strip that you place between the foundation and pavers as a filler.