The foam spider in the form of
The confederate General

Confederate General
     The White spider has been around for several years now.  It was originally invented by Carl Hanson And Lane "Smitty" Smith.  The original pattern was all white and is still an effective bream fly.  However, fly tyers love to experiment and soon "spiders" with different colored rubber legs and tails were being tied.  Orange are were said to be exceptionally good. 
     My own addition to the "spider" family has a gray body, red "sash" and yellow legs and tail.

Material List
Mustad 3366  size 10 or 12
size 03
2/3mm foam disk approx 1/2" wide
foam legs material.
dieStep 1.
Cut out foam disks from 2mm or 3mm craft foam.  You can use a .45 casing or cut a piece of  hobby copper about 2in. long.  Sharpen the edge.  Press down firmly, then twist.  Cut as many as you need.  If they stick in the die, dig them out with a dubbing needle.

I use 3mm on a no10 hook for most of my spiders, but can't get in Gray, so I use 2mm on a no12 hook.  They float better that way.
Step 2. Tie in at the middle of the hook by making about 10 turns forward and 10 turns backward.  Return to the center of the thread base.
tie in
Step 3.tail
Cut a clump of marabou About  1 1/2 the length of the hook.  You can go heavy on the quantity of tail..  Tie in and bring the thread back to the center of the shank.  (I usually put 2 or 3 half hitches here, to stabilize the fly)
Step 4.  Fold over the foam disk and press it around the hook.  The more you mash the better.  If you don't put enough pressure on it and start to tighten the thread, the body will spin around the hook shank.  

Make two turns.  Tighten, then make four or five more turns.  (I use another 3 half hitches here.)
Step 5.  folded legs Cut a rubber leg about 1" long.  Fold the leg over and wrap two turns to hold the legs in place.  Adjust the legs and apply two half hitches.
Step 6. take a couple of wraps under the foam, around the hook, behind the eye.  Tie off .   Cut the loop in the legs, and pull them till they're on each side of the body.  They should form an X, but don't worry if they don't.  The fish don't care.
final steps
Step 7. head cement
I apply glue to the bottom of the fly rather than the top.  Let the fly dry and you're ready to fish.
Notes on the fly.
Color: There are any number of craft foam colors, marabou colors and rubber leg colors.  There's nothing that says a spider has to be white, on white, in white.  You can experiment with thread, body, legs and tail all you want. 

Legs: How long  should the legs be? Length shouldn't be so long that the fish grab the legs rather then the fly.  I've even tied this fly without legs when they get to be to good at grabbing a "drumstick!"   I've fished long legs and short legs with success.

How thick should they be?  I normally use medium leg material, but thin legs abound. 
white body spider

An example of a mix and match spider.  white body and legs, yellow tail and red thread.