Great Garden Companions?

Any gardener will tell you that biodiversity and companion gardening are good things. The basic idea is that by combining certain types of plants you will introduce beneficial incects and nutrients to your garden ecosystem. With a few misplaced plants you can also make wackiness occur as well. For instance, placing a yellow squash next to a zucchini will produce a strange sort of hybrid mottled with yellow and green. Cool sounding but not altogether that appetizing. Similarly it is beneficial to plant other groupings together. Basil, when planted with tomatoes or peppers attracts beneficial insects which keep away other harmful pests.

But I must say that I was stumped when some friends sent me the pic of their recent venture into companion plants. Some say the one will go with anything. Others say that it comes with jail time. I say, gotcha back :)