Well, if you like the G-7900 "G-Rescue" Series (and I do), check out the same module (3194) in a 6900 case. As would be fit the "G-Lide" vibe, the GLX-6900 is a very glossy finish (in this case in black). The purple and light blue accents give it a summery, aquatic feel. I won't swear that this watch will ONLY see wrist time during the Summer, but I think it looks its best during this season. I think G-7900 plastic buttons might have been an interesting modification to the standard 6900 shape, but Casio did not opt for that (perhaps there are good reasons, financially, aesthetically or both).
I'm glad I opted for the black color. While I think the white version looks great; I think a high gloss white finish on a watch this size would likely not work for me.
Here are few Blackberry shots in slightly more natural light (via the window of a cab):