Petr Laštovička's website has some games released under a "reciprocal public license".
XMSOL.EXE is an excellent collection of solitaire card games that would be suitable - and simple - for portable apps wrapping.
The license is a bit confusing, but I don't think it'd prevent protable apps use. And I'm sure that Petr would be pleased about many people using his apps.
Petr Laštovička's website
Reciprocal Public License