I can give some tips online - but you will really need to go shopping "live" and try things on to make sure they look and fit the way you like.
Here are a few questions to consider:
1. Length of gown (I'm assuming floor length - but just checking to be sure)?
2. What type of "sleeve" - long, 3/4, short, spaghetti straps, or strapless?
3. The neckline you like best: square neck, scoop, boat (which is the one that opens shoulder to shoulder), sweetheart (the one that kind of swoops over the breastline)?
4. Color: your favorite color (of cours), but also do you like only solids, or bold prints, stripes, florals, etc?
5. I'm gathering from your other posts that you don't really want frills or lace, but what about sequins or other decorations?
Ok - so think about those things, and let us know what you lean towards, and maybe I can find some exmaples online.
Who knows - maybe I'll start a new career as a personal buyer after this!

Here's a couple that I thought were really different, and not terribly "girly" looking: