We've got jello on the brain lately. Anything that jazzes up an old standby gets our attention and this recipe for rainbow jello definitely qualifies.Just how do you make this pretty confection? Remember your primary colors. Do Better blog tells us you'll need a box each of red, yellow and blue jellos plus a box of knox gelatin. To create the layers of color, mix each color jello individually with an envelope of gelatin. Start with the blue. Pour into a pan and let set in the refrigerator. Repeat this process with the two remaining colors, first yellow and then red. You read correctly - you never mix the colors; there is no green layer. But the blue jello and the yellow jello together looks like there is a green layer. Cool huh? Check out the detailed recipe over at Do Better blog.