You can’t do it like that – the point of generics is mostly compile-time type-safety – but you can do it with reflection:
public Dictionary<Type, object> GenerateLists(List<Type> types)
{
Dictionary<Type, object> lists = new Dictionary<Type, object>();
foreach (Type type in types)
{
Type genericList = typeof(List<>).MakeGenericType(type);
lists.Add(type, Activator.CreateInstance(genericList));
}
return lists;
}