Thanks for all the replies!
The ice cubes sounds like fun. It might even draw some attention when people see me fill 'er up with fresh ice...
Well, maybe I'll stick with the mesh pants and leave it at that. Actually, I have thought about wetting (and re-wetting) down my shirt for summer riding.
The thought of leathers makes me want to give up riding altogether. I would probably not be able to retain control of the bike with that level of overheating and discomfort. So, for me it would be more dangerous than riding naked.
I already wear a mesh jacket and pants year round. It really helps. Temps here are generally low nineties during the summer. Of course, it gets hotter over the asphalt. Humidity is very high. Still, I find that the air flow through the mesh helps. For me, it's also part of the fun.
I already have black mesh pants. My issue is that I can feel my legs cooking in the sun. When I'm not riding, I've learned to wear light colors in the sun because I can really feel the difference in heat absorbtion.
So, I might check out the Fieldsheer pants unless someone else has another suggestion for light colored mesh pants.
Thanks again all for all the ideas.