My two girls (4&5yrs) have a decent herd of G3's and a couple of baity g1's. They really are play things for them so they get dolled up, have weddings, go on indiana jones style adventures and hang upside down on my A frame clothes airer (gotta love those g3 magnetic hooves).
So whilst they aren't really 'collection' ponies, they do have a special ritual however....
If Mummy gets a pony parcel, suddenly there's a herd to greet the newcomer!! I usually get to open my parcel, then I have to walk away for a minute or two while the newbie gets a dozen introductions and makes new friends