Okay, the colors are not ones I chose because I thought they were good (except the dive flag and international alpha, of course). I just needed contrasting colors to show the concept. I figured the artists would take care of the real thing.
The rectangle background will not exist in the final logo. It'll be transparent (on screen) or not printed (on things). The "ISOSAD" will slightly break the oval, as roughly pictured. That's a design element that actually adds quite a bit to the logo (having it all in the oval is confined and stagnant; having the name breaking through both draws the eyes to it and adds a dynamic that would otherwise be lacking).
Basically, the oval needs to have a slight "rim" (or "pizza crust") to it so it isn't flat and drab, the cards need rounded corners (to make them more card-like and less rectangulish), the complete portions of the visible faces of the cards need to be drawn (I'd recommend the classic "ace of spades" for the playing card, and how about a "wild draw four" for the UNO card?), and the ISOSAD needs to be properly embellished (but very slightly, as text embellished too much loses its punch).
That still leaves the coloration... The nitrox colors were accidental, but including them seems like a good idea now, but what colors to use where is still up in the air. The oval had better not stay that garish color!
It would be a good idea to pay attention to luminosity when applying the color scheme, as that will be the primary determinant of legibility when printed in black and white or photocopied.
Incidentally, I suppose I've now volunteered to vectorize the final art, eh? Not a problem, I guess. (The final's got to be in vector form, as raster graphics don't scale well.) Does anyone know any artist-type people? J.'s little sister can probably sketch it out for me to vectorize, I guess, if nobody else is handy.