Advice on my physics project idea?

Hi guys,

I'm doing to do a physics project and present my results this Monday. My idea is to measure the temperatures various colors absorb from the sun. The project calls for 6 glass jars, fill them with water, and covering those jars with different colored construction paper--then measure each temperature after time, but I was thinking of doing it instead with different colors of cloth (like shirts or cloth from Wal-Mart or Michaels), and using thin plastic containers instead of glass jars. Would this be a better alternative? The reason I want to do this is because I was thinking thin plastic containers would absorb heat better than glass jars, and colored cloth would be more realistic than colored construction paper. (or what if i just filled big ziploc bags with water and covered them with the cloth?)

What do you think? The point of this project is to measure the temperature each color absorbs from the sun (like when we say wearing black makes us hotter, i want to prove this through actual temperatures).