Here's a few for you to consider
Start with the easiest:

Chrome finish 5 inch blank. Painted only on once side, chrome the back side.
Blue leading edge with striations fading to turquoise close to lateral line.
Graduated dots down center.
Yellow belly should run up behind gill plate and to nose.
Yellow Eye.
Flipper tail optional.
Then a Herring:

Chrome back side - 4.5 inch blank.
Mother of Pearl base on painted side.
Blue Green Mist leading edge fading to light turquoise at lateral line.
Scale Pattern on leading edge.
Light dusting of pink/purple over flanks.
Yellow Eye.
Flipper should be on this one.
Then one I would dearly love to see!

6 inch slender spoon blank, chrome back side.
Mother of Pearl base on painted side.
Dark Blue/Green along leading edge, fading to blue-green mist then to light turquoise to lateral line.
VERY pronounced emerald green (or even lighter) stripe along lateral line. Would be extremely good if this could be in glow and/or metallic paint!
Striations along length of leading edge and 1/3 of belly to tail.
Flipper tail should also be on this one.
To get the right flutter suggest this type of curve:

Would be even finer were the top leading edge to be striated metal (stamped) along the leading edge.
All should be constructed with welded rings, and a good swivel on the leading end.
Feel free to PM is you have any questions. Would very much like to see the needlefish developed - methinks it would prove to be a
KILLER!
Cheers,
Nog