Here are some great barbell complexes from Dan John, one of the great strength and conditioning coaches out there. These are tough and really get the heart rate up there. http://danjohn.net/pdfs/complex.pdf
In case the link doesn’t work, search Dan John Barbell Complexes and they should come up.
This barbell workout from ACE is one of my favorites (most of it can be done as a barbell complex). I use it with clients and do this one on my own when I have the time.
Hope this helps!