Blue screen lighting problems.

Okay, right now the materials I have are 2 lego base plates, 2 desklamps running at 70 watts,sheets of oragami paper(colors of red green and blue) used for green screen, 1 minicam pro and a bin of legos. Also helium frog 2.06.

I improvised alot of materials as you can see. But now I am having problems with getting the green screen properly lit.I put my desk lamps at both side of the paper(tacked to a wall) and turn them on. This makes the oragami paper too bright to be the right color for the program to pick up.But when I only use one lamp the lighting is way to uneven.I would really not prefer to buy new things but are there any settings for me to mess around with? or techniques I should try? Thank you!