Panic doesn't really become non-standard until stage three, since it adds the non-standard win condition of the enemies cart falling off. As far as Whalerace, having a whale for a cart doesn't change the fact its a pretty standard PLR map.
Other than Pipeball, I cant think of a single map that isnt CTF, CP, PL, or PLR....
PL_juggernaut adds non-standard gameplay with the addition of respawnable sentry guns on the massive cart if you stand on a CP, but the map overall is a snipefest (whole map is a tunnel)
Also, on a sidenote, juggernaut has one of the most beautiful iris doors Ive ever seen in tf2. (textured ala orange
)
The mario-kart spinoff maps that teddy ruxpin made were HUGE maps with cool things all over the place, blocks 1000 feet in the air, flying racecars, cannons to launch you out of your base, mazes, and more. Unfortunately it only seemed to play well on his modded server (low grav, extra sentries, ect.)