Those comsumptive semi postals are beautiful. There's really something amazing about that ornate Victorian style.
I've always like semi postals, for some reason. They often seem more to the point, and are sometimes quite poignant.
On the handsome side, here's a Belgian set I sold just yesterday on
ebay.

King Leopold III in a military plane.
The surtax was for the benefit of the National Fund for Aeronautical Propaganda. Well, ok, maybe not so poignant.