This is were you can create a mixture of objects creating your own objects using the pathfinder tool. Saving the picture; you must save it as an eps so that you can open it up on photoshop to save as a jpeg. Then you can post it in your blog.
Creating the two colors are easy; you begin at (1) mode (2) then to transfer it to a gray scale (3) then click on duotone (choose colors) (4) and then you are all set!