High temp, low humidity - ice cube solution?

Ok so I have a small cupboard op going down. Basically one plant is receiving 2x 46w cfl's, and 1x 23w cfl. The temperature is slightly high; it averages around 27-30C, and the humidity level stays between 24-29%. With the cupboard doors open, we have a fan cooling the temperature; to keep it below 30C. But having the doors always open reduces the humidity. We have looked at the Vick's Cool Mist humidifiers but the space is so small we don't have room for it. We have been adding water and wet towels for humidity. Basically we were wondering, do you think adding an ice cube tray would slightly increase humidity, and slightly decrease the temperature?

I'm still new at this, but I'd think that a cup of water might be more productive than cubes since it takes a lot of energy to melt the ice and then vaporize it. You might get a lot of mileage out of a simple swamp cooler (that would kill two birds with one stone). http://www.halfbakery.com/idea/Swamp_20cooler_20_2f_20humidifier_20fan_20attachement just googling around a bit I found this. The basic principle is you're blowing air over a moist towel which keeps the air more humid and cools it.