I decided to alternate the base color, the big skein, with other colors. The base color 
is always a row of single crochet, and the other stripes will be whatever is in the 
bag that I think will look good at that point, and those rows are half double crochet.

The ribbing at the wrists and bottom are of the base color, and every time I do a 
row of that I do two rows of ribbing, turning it after the first row, one row of 
which is for the row of the other color. The ribbing is single crochet in the back 
loops.

The stripes are sort of L shaped, starting at the bottom and going up, then out 
to the end of the sleeve. I have a center row of the base color, then the stripes 
are symmetrical going out from there.

So here's how I started it:

    * Make a row of chains as long as the distance from wherever you want the 
         bottom of this sweater to be, up to your collarbone. Put a marker 11 
         stitches from the bottom (the ribbing is 10 stitches). Make sure you put 
         this marker on the side where the chains are Vs, rather than the back side, 
         because this marker will let you know which is the right side of your sweater 
         while you're making the front and the back.

    * Put another marker on the chains where your collarbone is. Continue chaining 
         about 4 more inches, put another marker there. Then hold the collarbone marker 
         where it's supposed to go, and the second marker on your neck at the top of 
         your shoulder, and continue the chains to wherever you want the end of the 
         wristband to hit you. Put another marker 11 stitches in from the end of the 
         wrist. Pull through, leaving about 3 inches, and cut it off.

    * Attach the yarn at the collarbone marker, chain four inches, mark and chain the 
         same length you did on the other side. Mark the 11th stitch, pull through 
         and cut the yarn.

    * So what you now have is a y, with markers at 4 inches from where they come 
         together. This is the front center line and the tops of the shoulders of one 
         side of the sweater (you'll do two sides and sew them together).

    * Every time you do a color, you'll do it on both sides of that center chain, the 
         same color. As you're looking at the sweater laid out on a table in a kind of Y, 
         with the right side marker facing you, you'll start at the bottom on the right 
         side of the marker, and crochet out to the wrist, then on the other side you'll 
         start at the wrist and crochet back to the bottom front. This will make the 
         stitches look alike from the front.

    * So pick your next color, and half double crochet from the marker above the front 
         ribbing, crocheting on the right side, to the wrist marker. Then on the other 
         side, crochet from the wrist marker back to the bottom front.

    * Then do a row of your base color, single crocheting, and doing two rows of 
         ribbing on each end of the row, slipstitching it to the other color so there's 
         no hole (you do this every time). Also, starting with this row, skip one loop 
         at each of the middle markers, the collarbone one and the top-of-shoulder one, 
         in each row. This will pull the shoulders down til they become perpendicular 
         with the front, and also make the neck a nice V. 

Here's a closeup of the front:

I'm still on this part. Here's the THEORY for the rest of the sweater, I'll let you 
know how it comes out. Here's the end, as I see it:

I've finished all the decreases at the markers, and this side of the sweater is nicely 
shaped.

Now I'm continuing as I started until the wrist ribbing has gotten to half the size 
of my wrists, at which point it's done. Then I'm going to make each row of crochet 
out to the wrist a bit shorter, although I'm still trying to decide how many stitches 
I'm going to shorten it in each row.

When I'm at the poing where the sleeves are as short as the width of the body of 
the sweater, if that comes out even, I'm done. If it doesn't, I'll continue the 
vertical rows until it's wide enough.

Then I'll make the other side of the sweater the same way, with a different order 
to the stipe pattern, sew them together...and I'm hoping it'll be beautiful.