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First, you need to look at the yellow rod. A yellow rod makes FIVE white squares so that is one way. Now, look at the red rod. 1 red rod = 2 white rods, so you could make 2 reds and 1 white, as well as the inverse (1 white and 2 red). Then you could do others based on what you just worked out (eg. red, white, red). You could also do 3 white and 1 red and make combinations from that.

Now, look at the dark green rod. 1 dark green rod = 6 WHITE rods. So you could do 3 reds next to each other. You could also do 2 white and 2 red, etc.