Hey!

Just wanted to say quick, I can't say for 100% sure how 888 made the buttons, but to me it looks like a simple task. It's called a gradient overlay/gradient fill. You create a layer in the shape you want the button to be (square/rectangle tool), feather it a few pixels to get the proper "button" look, add bevels on it and then add a gradient. I've never used GIMP, but in photoshop it's as simple as right clicking the layer (the rectangle you made), select "Blending Options" and there's a tab called "gradient overlay" which gives the effect you want. You can make the effect straight out on normal shapes, but I prefer to use layers and basic forms for most work.

You know what, frak it. Here's a short video explaining what I mean:

https://drive.google.com/file/d/0B3v...it?usp=sharing

Also, since I forgot to turn off the honeycomb overlay, hers' two pictures to show the button with and without the honeycomb, so you can see it clearly:

http://i.imgur.com/srPZ0go.jpg(with)

http://i.imgur.com/KzdBxD8.jpg(without (clean))

I just slapped on the default settings there, but you can adjust the ammount of blend for each color, where it starts etc. so you can get it exactly how you like.