Good heavens, that's soooo complicated!
Here's what our guild does:
All members who wish to participate for the year put their names in a basket. Each month, two names are drawn. Those two members supply instructions for the block of their choice, along with color preferences for the next month's newsletter. Then, the other members make a block for each gal to those specifications and bring them to the next meeting. If you don't make blocks and your name is drawn, you forfeit your turn and your name goes back into the basket.
We've done this for years, and it works fairly well; we've discovered that you get better results if you choose a fairly simple block pattern for your turn. Some gals even ask for a couple squares of fabric, rather than a sewn block.