HAH!
Funny you should say that! I know when I hand feed my Dragon(s) pellets, they seem to go for the GREEN ones in my hand readily. But when I present a yellow pellet(rep cal adult BD pellets) they, or at least one tends to stop eating. I figured it was the yellow color. But they'll still take them(yellow) eventually.
Now, when I feed them Can o Crickets with my feeding tongs, they go after the bright yellow tongs almost as many times as the fat cricket beings presented. Sometimes they go right around the cricket and grab the tongs. I figured the bright yellow plastic had something to do with it. This is also why I wondered about Dragon eyesight.
Often just putting the tongs in the tank will get them jumping up with tongues stuck out.
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0.0.2 Bearded Dragons(Ziggy and Stardust)