You want a cricket imitation eh?
Well, with what you have on your list, I'd use:
foam (black if you've got it)
Peacock herl (the fibers from the peacock feather)
The darkest hackle you have
The darkest fibers off your pheasant tail
Wrap a thread base on your hook
Tie in the hackle by the tip, then flare the fibers back so they stick right out to the sides
Tie in 3 or 4 of the nicest pieces of peacock herl you can find by their bases at the same point you tie in the hackle feather
Wrap the peacock around the body, 3/4 the way from the start of the bend to the hook eye, and secure it with a couple half hitches or a whip finish
Wind your hackle feather forward, stopping at the same point you did the peacock body.
Trim two roughly identical length clumps of pheasant fibers - only 2 or 3 fibers in the clump, and tie an overhand knot near the tip ends of the fibers, so that you have a roughly 45-90 degree bend in the fibers now. Trim the butt ends and the tip ends so that they're the same lengths, roughly equal in length to the body of the fly.
Tie these in where you finished the herl and hackle, secure with a couple half hitches or whip finishes, and apply a dab of head cement. You can now cut the thread here.
Cut a triangle shaped piece of foam the length of your hook shank, with the widest part being a little less than twice the distance of your hook gap. Round the tips off of your trinagle, to keep things neat looking.
Fold the foam over the body of the fly, with the wide end at the head of the fly. Now wrap this down about 1/3 of the way back from the eye of the hook. Use a three or four half hitches over your wraps, and apply a light coat of head cement over the thread on the sides and top of the fly.
You now have a black (or at least darkly colored) cricket. The foam supplies the floatation, so the hackle doesn't need to support the fly - it just looks buggy.
Now, I'm guessing that when you said you had "foams" - you were talking the craft sheet foam you'd get at Jo Ann's or Micheal's or other craft store, that that's what I'm meaning when I say cut a triangular piece of foam. The nice thing about craft foam - if you have sharpies, you can color it as needed.
