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Here's the in-game pic: Titanium in the periodic table:

Go to cologne, you'll see: The clue spells http://tankionline.com/wasp/ Once you solve it, it should look like this: Then the image will change to the answer.

Honestly, I really don't like the crystal boxes being added to the fund: Assume you've been playing a 15 min match, and your team loses. If you're somewhere around the 3rd spot, them you hardly get any crystals... Even if you've been playing for the entire game. Usually, with a decent hours play, I get around 400 - 500 crystals (in all). To day I managed to rake in less than 150. The fact that the drops are added to the fund means that they are divided according to how active your are in the battle at the end. With the old system however, the more active your are in the game, the higher your reward. While those who are there mainly for collecting crystals get their crystals but a lesser reward. This seems biased towards campers. ( A well hidden shaft is usually the highest scorer) Keep, the gold box part though, that takes away the distraction.

Hmm... I already use Blender, GIMP, Inscape, and Paint.NET! But You forgot Krita!