fun with wireless routers

[pcm81]

What kind of "network security" fun can be had with 2 wireless routers? For example with a wireless and a wired only router one can do wired to wireless network isolation through NAT on wired only router. Is there any kind of extra fun that can be had with 2 wireless consumer grade routers? Netgear 3700 and netgear 4300v2.