OK, so this one has been put out of its misery.

Two people got it correct, and the one that posted about it pretty much guessed. (It's possible the other person also guessed.)
To their credit, TNT explained this one:
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Answer: Transparent
This one was a tough one! First thing you have to do is take the list of numbers and square them, and round them to the nearest whole number. So you get this list:
895
902
874
713
1221
404
1189
1100
527
201
314
From that list, find the game titles that correspond to those game ID's. For example, 895 is Dar-BLAT!!!, 902 is Carnival of Terror, etc.
Once you have all of the game titles, take the LAST letter of each of them, and string them together. You'll then find the name of our newest Neopets paintbrush colour!
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I wasn't even close on this one! I did look at game ids a little bit the first week, but didn't square the numbers first.