The back row shows three of the styles (L-R, Hotwheels Power Speedboat, Hotwheels Hydroplane, Matchbox Hydroplanes, and another Hotwheels Hydroplane.) I did some custom paint jobs, such as the zebra stripes, but there are plenty of different paint jobs available, you just have to look for them. I bought many of them for $1, and some I found for much less at the flea market and thrift stores.
The water tails are simply made from foam core board.
I thought I took pictures of the actual game, but I'll have to find them now as they seem to be mis-filed.