Basically you slice up a tshirt into ribbons and then weave it strategically back together.
Here's a variation on this that takes the basic shape of a sunflower.
These tshirts make cool bikini cover ups. You can also wear another colored camisole underneath.
And the best part is: it's easy to do!
Step 1: Stuff
cutting pattern (attached) (the first four pictures can be printed on 8-1/2 x 11 and then taped together to make an 18" wide design