I also noticed there are a LOT more Friesian crosses in the US than there are here in the Netherlands. Here hardly anyone crosses Friesians, although we have a country full of them. In general, Friesians don't cross that well with other breeds. The good looking crosses I see are mostly ASB / Andalusian and Knappstrupper crosses, and that isn't so surprising when you look at the type of horses in those breeds. Off course there are other good looking crosses, but if you keep shooting you always hit something......

What we do have here is the 'AraboFries' studbook, Friesian/Arabian horses. But in that studbook, the direct cross is not the breeding goal. The goal of the studbook is to create a horse that is Friesian in appearance, but does have more stamina. Friesian/Arab crosses were bred back to carefully selected purebred Friesians again untill they had basically Friesian horses with a small percentage of Arab. And THOSE horses are the base of the breed, those Friesans with a touch of Arab are bred together with now and then some outcrossing. Those horses are specifically bred to be sporthorses (as in actually performing, I really don't get the name 'Friesian Sport Horse' that is used in the US for any kind of Friesian cross), mostly for driving disciplines.
Arabo-Friezen:
http://www.youtube.com/watch?v=0vg10vj_xkI
http://www.youtube.com/watch?v=C1WL0fsS1mk

There's only one Friesian cross stallion in the Netherlands that I know of that's popular, Bonte Willem. His sire is Adel (GP friesian), his damline is Dutch WB, and is the same damline as that of the KWPN stallion Samber:
http://www.bontewillem.nl/DSC_6987.jpg
http://www.youtube.com/watch?v=uu0kYY_mx_k

HUP HOLLAND HUP