I have a total of 8 regular schoolchildren who come during a week, not usually all on the same day, ranging from 5 - 11 years, girls and boys.
We have a games console, but it obviously isn't feasible for all of them to play on it at the same time. If I'm very busy, I tend not to limit the time on it basically because it keeps them happy (although I'm not proud of that - but the parents are absolutely fine about it). The eye-toy is great - one of our games is a "group activity"! The console hardly ever gets used during the spring/summer months because they all tend to play outside.
My big ones (particularly older boys) maintain that they don't like drawing etc., but it's amazing how soon they change when they hear my stage whisper to a younger child about "picking your own England football squad/choosing team colours" or "how hard it must be to design a Formula One racing track".
I sometimes do stories with the younger ones and they pretend to be the characters - again, when we are in dire need of an ugly troll or a couple of extra goats, the big ones suddenly materialise.
The construction toys are always a big hit - Lego, Polydron, even marble runs and seeing who can build the tallest tower with wooden bricks. Although they love all the cars, trains, tracks and "boys toys", they also love play dough (who can make the longest piece of spaghetti), like decorating biscuits, and they do play with the doll's house and play kitchen/shop! If you asked them, they'd deny everything (but I think that this comes with time, newbies would never dare to be seen doing such stuff!) Your new boys will probably test the water for a while.
Having a houseful can be daunting, particularly when you have little ones around too but, for me, it becomes a hive of intent activity. I might be knee-deep in dirty nappies, so they might have to amuse themselves for a while, and as long as there's stuff to choose from, they do OK.